Amazon Has Its Own Universe. Know the Rules Before You Enter
FBA, FBM, ASIN, Buy Box, IPI score, Amazon doesn't ease you in gently. The platform rewards sellers who understand its logic and quietly penalises those who don't. This glossary breaks down Amazon's seller vocabulary from the ground up: fulfillment models, ranking signals, account health metrics, and the acronyms that actually move the needle. The more fluent you are, the more control you have.
Account Types & Platform Basics
What is 1P (First-Party / Vendor Central - VC)?
You sell products to Amazon as a wholesaler, and Amazon owns the inventory and sells to customers.
Why it matters: Amazon sets the retail price (often too low) and pays you Net 60–90 days. Margins are thinner, but you get massive bulk orders. You also give up control over your listing content.
What is 3P (Third-Party / Seller Central - SC)?
You sell products on Amazon's marketplace directly to customers.
Why it matters: You control pricing, listing content, and ad strategy. Margins are significantly higher, but you bear all risk of inventory, returns, and advertising costs. This is where 90%+ of new sellers start.
What is SC (Seller Central)?
The backend dashboard where 3P sellers manage listings, inventory, payments, and advertising.
Why it matters: Your daily command center. Mastering SC's "Reports" section (Inventory, Payments, Business Reports) is critical for data-driven decision-making.
What is VC (Vendor Central)?
The specific portal for 1P sellers.
Why it matters: Invite-only. Having a VC account gives you access to Amazon's "Retail Analytics" and automatic A+ Content, but Amazon constantly pressures you to lower your cost price.
What is a Vendor (Vendor Central)?
Vendor Central is an invite-only program for brand owners and manufacturers who sell their products wholesale to Amazon (1P model). As a Vendor, you set the wholesale price and ship products to Amazon. Amazon then handles all retail pricing, inventory management, fulfillment, and customer service. You operate through the Vendor Central portal and receive payments via invoices, often on Net 60–90 day terms.
Why it matters: Vendors gain access to Amazon's massive customer base and fulfillment capabilities, but give up control over their retail price and listing content. Margins are typically thinner, but you receive large bulk orders. Many sellers start on Seller Central (3P) and later transition to Vendor Central once their brand is well-established.
What is AWS (Amazon Web Services)?
AWS is Amazon's cloud computing platform. In the seller context, AWS is relevant because SP-API runs on AWS infrastructure — you must direct API requests to specific AWS regions. Additionally, AWS Marketplace allows software vendors to sell their products and services to AWS customers.
Why it matters: If you're building custom tools or using third-party software to manage your Amazon business, understanding AWS basics helps with API integrations, data storage, and scalability. Some sellers also use AWS services for analytics, inventory management, or building their own dashboards.
What is an API (Application Programming Interface)?
Code that allows different software systems to talk directly to Amazon.
Why it matters: Manual copy-pasting doesn't scale. Using the API allows you to automate repricing, bulk inventory updates, and order syncing with your 3PL. Saves dozens of hours per week.
What is MWS (Amazon Marketplace Web Service)?
MWS was the legacy API suite that allowed sellers to programmatically access data and perform operations available in Seller Central. It could handle orders, inventory, payments, reports, and more.
Why it matters: MWS is now deprecated. Amazon officially ended MWS on March 31, 2024. All sellers and developers must migrate to SP-API (Selling Partner API), which offers the same functionality plus many new features. If you're still using MWS, you need to update your integrations immediately.
What is SP-API (Selling Partner API)?
SP-API is the modern replacement for MWS — a REST-based API that helps Amazon selling partners programmatically access their data on orders, shipments, payments, and much more. It offers OAuth authorization workflows, SDK generation, and sandbox testing environments.
Why it matters: SP-API is the current and future standard for Amazon API integrations. Applications using SP-API can increase selling efficiency, reduce labor requirements, and improve customer response times. You only need to register as a developer once to create an SP-API application that works across any region or marketplace.
What is a VPN (Virtual Private Network)?
A service that encrypts your internet connection and masks your IP address.
Why it matters: Many sellers use VPNs to access accounts securely from public Wi-Fi. However, logging into Seller Central from a VPN used by a banned seller can trigger a soft "related account" flag — use a dedicated residential IP instead.
What is OTP (One-Time Password)?
A temporary verification code sent to your phone/email for 2FA (Two-Factor Authentication).
Why it matters: Amazon forces OTP for critical account changes. If you lose access to your 2FA device, you could be locked out of your account for weeks. Always back up your OTP codes.
What is a Listing (PDP - Product Detail Page)?
The entire digital storefront for a product, including title, bullets, images, A+ Content, and reviews.
Why it matters: This is your conversion engine. A high click-through rate from ads means nothing if your listing doesn't convert. Every element must answer: "Will this solve my problem?"
What are Q1, Q2, Q3, Q4 (Quarters)?
The four 3-month periods of the fiscal year (Jan–Mar, Apr–Jun, Jul–Sep, Oct–Dec).
Why it matters: Q4 is the golden quarter (holiday sales). Q1 is "return season" (January returns flood in). Q2 and Q3 are usually slower but critical for building inventory and reviews in preparation for Q4. Your POs must account for Q4 shipping lead times (place orders by August).
What is a POC (Point of Contact)?
The specific person you deal with at Amazon Seller Support, a 3PL, or a supplier.
Why it matters: Seller Support is notorious for inconsistent answers. Having a direct POC (especially a higher-tier POC) is the only way to resolve complex account issues quickly.
What is SAS (Strategic Account Services)?
Amazon's premium concierge service providing a dedicated account manager and strategic guidance.
Why it matters: Provides faster escalation paths for suspensions/errors and data-driven recommendations. However, many sellers find it expensive ($5k/6 months) and focused more on data/reports than hands-on support. Typically for sellers >$1M/year in sales.
What is an SOP (Standard Operating Procedure)?
A documented step-by-step process for repetitive tasks (e.g., "How to launch a new ASIN" or "How to handle a return").
Why it matters: Without SOPs, scaling a business leads to chaos. SOPs ensure quality control and make it easy to train virtual assistants to take over mundane tasks.
Operations & Fulfillment
What is FBA (Fulfillment by Amazon)?
Amazon stores, picks, packs, ships, and handles customer service for your products.
Why it matters: Unlocks the Prime badge (higher conversion rates, 20–30% more sales). However, fees are rising, and storage limits are strictly enforced. You must treat FBA like a JIT (Just-In-Time) inventory system to avoid surcharges.
What is FBM (Fulfillment by Merchant)?
You store inventory and ship orders directly to customers.
Why it matters: Gives you full control over packaging and customer communication, and saves on FBA fees for oversized/heavy items. However, winning the Buy Box is much harder without Premium Shipping (1–2 day) metrics.
What is a 3PL (Third-Party Logistics)?
An external warehouse you rent to store inventory before sending it to FBA (or for FBM).
Why it matters: Used to bypass Amazon's storage limits and reduce long-term storage fees. A good 3PL offers cheaper storage than FBA and can perform kitting/prep services before forwarding inventory to FCs.
What is an FC (Fulfillment Center)?
Amazon's massive warehouses where inventory is stored and shipped from.
Why it matters: Proximity matters. If your inventory lands in a distant FC (e.g., California) but your customers are on the East Coast, delivery times and shipping costs increase. Strategic shipping to multiple FCs reduces these costs.
What is Outbound?
The process of shipping a product from the FC to the end customer.
Why it matters: Outbound shipping fees are deducted from your FBA revenue. Reducing dimensional weight (by optimizing packaging) directly reduces these fees — often saving $1–$3 per unit.
What is Unfulfillable?
Inventory in an FC that is damaged, defective, or has a labeling issue and cannot be sold.
Why it matters: This inventory still accrues storage fees. You must create a "removal order" to return or dispose of it. High unfulfillable rates indicate poor packaging quality or a manufacturing defect.
What is Healthy / Unhealthy (Inventory Health)?
Metrics like Inventory Performance Index (IPI), sell-through rate, and excess stock levels.
Why it matters: Unhealthy inventory (aged >365 days or excess) incurs massive long-term storage fees and eats cash flow. Healthy inventory has a high sell-through rate (units sold ÷ units available) and minimizes storage costs. Amazon punishes unhealthy IPI with storage volume restrictions.
What is MCF (Multi-Channel Fulfillment)?
MCF is a third-party logistics (3PL) solution that lets you use Amazon's fulfillment network to deliver orders from any sales channel — not just Amazon. MCF stores your inventory, then picks, packs, and ships orders from your direct-to-consumer website, other ecommerce marketplaces (like Walmart), or social media stores.
Why it matters: If you already use FBA, you can use your existing FBA inventory to fulfill orders across all your channels. Merchants using MCF report a 19% increase in sales and 10% increase in profitability on average. It offers fast delivery (Standard within 3 business days, Expedited within 2) and integrates with over 100 ecommerce platforms. Eligible sellers can save up to 15% on MCF fees.
What is AGL (Amazon Global Logistics)?
AGL is Amazon's first-party cross-border logistics service for FBA sellers. It ships your FBA inventory from origin countries (like China) to Amazon fulfillment centers worldwide — including the US, UK, France, Germany, Italy, and Spain. AGL handles ocean freight (FCL and LCL), customs clearance, and documentation.
Why it matters: AGL simplifies international shipping by providing an end-to-end solution within the Amazon ecosystem. It reduces the complexity of dealing with multiple freight forwarders and customs brokers. Some sellers report reducing overall logistics costs by approximately 30% using AGL. AGL is a key component of Amazon's broader "Supply Chain by Amazon" solution.
What is AWD (Amazon Warehousing and Distribution)?
AWD is a low-cost bulk storage solution that distributes seller inventory to the Amazon store and non-Amazon sales channels. Its auto-replenishment capability automatically sends products to FBA when needed, keeping your FBA inventory in stock and optimally placed for fast delivery.
Why it matters: AWD solves the problem of FBA storage limits and long-term storage fees. It offers cost-effective long-term storage and automatically replenishes your FBA inventory before it runs out. AWD pricing covers FBA inbound placement, so there's no separate charge for that service. If you struggle with inventory forecasting or FBA capacity restrictions, AWD is a powerful solution.
What is PCP (Amazon Partnered Carrier Program)?
PCP is a program offering discounted shipping rates when sending inventory to Amazon fulfillment centers. You can buy and print shipping labels, schedule pickups, and track shipments — all within Seller Central. It's available to all sellers using FBA, MCF, and AWD.
Why it matters: PCP simplifies inbound logistics and often provides lower rates than arranging your own shipping. It eliminates the need to engage third-party carriers separately. Using PCP can speed up inventory receipt at fulfillment centers, making your products available to customers faster. Note that rates vary by region — for example, Australia charges a flat AUD 4.99 per box.
What is a PO (Purchase Order)?
An official document sent to a supplier to order inventory.
Why it matters: Managing POs with clear lead times prevents stockouts. If you don't have a PO system, you will inevitably reorder too late and miss peak sales windows (like Prime Day).
Sourcing & Account Health
What is OA (Online Arbitrage)?
Buying products from online retailers (e.g., Walmart, Target) at a discount and reshipping them to Amazon.
Why it matters: Low barrier to entry, but brutal competition and high risk of "inauthenticity" claims. Success depends entirely on speed — you must buy before the source sells out.
What is RA (Retail Arbitrage)?
Physically going to brick-and-mortar stores, scanning clearance items, and reselling them on Amazon.
Why it matters: Highly risky. Many brands are now "gated" (requiring permission). If the store receipt doesn't match Amazon's invoice requirements, you will lose A-to-Z claims and may be suspended for sourcing violations.
What is WS (Wholesale)?
Buying branded products in bulk directly from authorized distributors or the brand itself.
Why it matters: More stable and scalable than arbitrage. You get legitimate invoices (crucial for account health) and often better margins per unit due to volume discounts. The downside is thin margins and high upfront capital.
What is an ASIN (Amazon Standard Identification Number)?
A unique 10-character alphanumeric code assigned by Amazon to every product.
Why it matters: This is the "Social Security Number" of your product. Inventory, reviews, ads, and FBA fees are all tied to the ASIN. Merging or splitting ASINs (variations) is how you manage ranking power across sizes/colors.
What is a GTIN (Global Trade Item Number)?
A universal product identifier (e.g., UPC, EAN, ISBN).
Why it matters: You must have a valid GTIN purchased from GS1 (not a cheap reseller) to create a new listing. Invalid GTINs lead to listing suppression and can block your Brand Registry application.
What is an EAN (European Article Number)?
A 13-digit GTIN standard used primarily in Europe.
Why it matters: If you sell in EU marketplaces (UK, DE, FR, etc.), you need EANs. Using a UPC in Europe often works, but local regulations strongly prefer EANs for customs and catalog matching.
What is an FNSKU (Fulfillment Network Stock Keeping Unit)?
A unique Amazon-assigned identifier for FBA products, starting with "X". It tracks your specific inventory within Amazon's fulfillment network.
Why it matters: This barcode is physically printed on your product labels. If you use the manufacturer's UPC instead of the FNSKU, you risk "comingled" inventory — your units get mixed with other sellers', destroying quality control. No two sellers share the same FNSKU.
What is LSR (Late Shipment Rate)?
The percentage of FBM orders shipped after the expected ship date.
Why it matters: Must stay below 4%. High LSR triggers account deactivation. It's a direct measure of your operational reliability.
What is VTR (Valid Tracking Rate)?
The percentage of FBM orders with a valid, carrier-scannable tracking number uploaded within 24 hours.
Why it matters: Must stay above 95% for most categories. Low VTR negatively impacts your Buy Box eligibility and triggers ship-date latency alerts.
What is the A-to-Z Guarantee?
A claim filed by a buyer when dissatisfied with an FBM order (e.g., didn't arrive, damaged, or not as described).
Why it matters: A single A-to-Z claim can tank your Order Defect Rate (ODR). Never fight a losing A-to-Z claim — refund the buyer immediately to preserve account health. ODR must stay under 1%.
What is NCX (Negative Customer Experience)?
A return or refund where the buyer didn't explicitly open a case, but the system detects dissatisfaction (e.g., "wrong size," "defective").
Why it matters: High NCX rates (>10%) trigger automatic listing suppression or removal, even if your reviews are good. It forces you to fix the root cause (manufacturing, sizing charts, or imagery) immediately.
What is Hazmat (Hazardous Materials)?
Products containing liquids, aerosols, lithium batteries, or flammable substances.
Why it matters: Hazmat items require special FBA prep, additional fees, and cannot be shipped via standard air transport. If you misclassify a hazmat product, Amazon will reject your inbound shipment or, worse, destroy it without reimbursement.
What is a Rights Owner?
The legal entity that holds the intellectual property (trademark, copyright, patent) for a product.
Why it matters: Only Rights Owners can enroll in Amazon Brand Registry. This unlocks access to A+ Content, Brand Analytics, and the "Report a Violation" tool to remove hijackers and counterfeiters.
What is the USPTO (United States Patent and Trademark Office)?
The US government body that registers trademarks.
Why it matters: Amazon requires a registered (or pending) USPTO trademark for Brand Registry. A dead or refused trademark application blocks you from the most important defensive tool on the platform.
What is SFP (Seller Fulfilled Prime)?
A program allowing FBM sellers to display the Prime badge if they meet strict 1–2 day delivery standards nationwide.
Why it matters: SFP listings are treated as Prime-eligible, giving increased chances of becoming the Featured Offer. Requires meeting strict performance metrics: ODR <1%, pre-fulfillment cancel rate <2.5%, late shipment rate <4%. Open for new enrollments since October 2023.
Analytics & Finances
What is BSR (Best Seller Rank)?
A numerical rank within a product category (1 = highest sales velocity), based on current and historical sales data. BSR fluctuates hourly and is category-specific.
Why it matters: BSR is the single best real-time indicator of demand. Sellers use it to forecast inventory needs and estimate daily unit sales for product research.
What is MAP (Minimum Advertised Price)?
A price floor set by a brand or manufacturer that retailers cannot advertise below.
Why it matters: Violating MAP gets you blacklisted by distributors. You can sell below MAP in the "shopping cart," but you cannot display the lower price in the title or bullet points. Smart sellers use coupons to effectively discount without violating MAP rules.
What is RPB (Retail Price Benchmark)?
The suggested retail price (SRP) or the average price across major retailers.
Why it matters: Amazon's algorithm uses this to compare your pricing. If your price is significantly above the RPB, you lose the Buy Box. Used to set competitive pricing strategies.
What is COGS (Cost of Goods Sold)?
Total cost to manufacture and ship a unit to your warehouse (or Amazon's FC).
Why it matters: This is the foundation of your business. If COGS plus FBA fees exceed your selling price, you have no room for ads or profit. A $0.50 reduction in COGS directly increases your bottom line by thousands over a year.
What is AOV (Average Order Value)?
Total Revenue ÷ Total Number of Orders.
Why it matters: A high AOV allows you to bid more aggressively on PPC because you make more money per transaction. Strategies like "Buy 2, Save 10%" or bundling complementary products are aimed squarely at increasing AOV.
What is LTV (Lifetime Value)?
The total profit you expect to earn from a single customer over their entire relationship with you.
Why it matters: This determines your maximum allowable customer acquisition cost. If LTV is $200, you can afford to break even on the first order to acquire them, knowing you'll profit on reorders. Critical for subscription models.
What is ABA (Amazon Brand Analytics)?
A free tool for brand-registered sellers offering insights into customer behavior, search terms, market basket analysis, repeat purchase behavior, and demographics.
Why it matters: This is your goldmine for SEO. You can see exactly which search terms drive the most conversions for your category — data that third-party tools can only guess at.
What is an Incentive?
Promotional tools like coupons, lightning deals, or giveaways.
Why it matters: Incentives boost conversion velocity, which improves BSR. However, they train customers to wait for discounts. Use them surgically — to launch new products, clear seasonal inventory, or reactivate dormant ASINs — never as a permanent crutch.
What is a Test Buy?
Ordering a competitor's product (or your own) to inspect quality, packaging, or authenticity.
Why it matters: This is the primary method for catching counterfeiters or hijackers. As a Rights Owner, you perform a test buy, then file an infringement claim with Amazon using the order ID as evidence.
What is HBS (Home, Beauty, and Sports)?
A common category cluster used internally for inventory categorization.
Why it matters: These categories have specific gating requirements and intense seasonal demand (e.g., sports gear in summer, beauty in Q4). Understanding your HBS cluster helps you benchmark against competitors.
What is MYCE (Manage Your Customer Engagement)?
A program that lets brands send marketing emails directly to Amazon customers who follow their brand.
Why it matters: Allows you to announce new product launches or exclusive deals to your loyal fanbase without paying for off-Amazon ads. Only works for "Brand Followers."
Advertising & Marketing
What is SP (Sponsored Products)?
Pay-per-click (PPC) ads that display individual product listings within Amazon search results and on product detail pages.
Why it matters: These capture high-intent shoppers actively searching for your exact product. They are your primary driver of immediate, attributable sales. Poor keyword targeting here burns cash fast.
What is SB (Sponsored Brands)?
PPC ads featuring your brand logo, a headline, and a curated selection of 2–3 products, appearing at the top of search results.
Why it matters: This is a top-of-funnel awareness tool. Even if shoppers don't click, brand impression builds trust. It directs traffic to your Store or a curated landing page, increasing the chance of multi-item purchases.
What is SD (Sponsored Display)?
The percentage of direct sales from sponsored ads campaigns spent on advertising. Calculated as (Ad Spend ÷ Ad-Attributed Sales) × 100.
Why it matters: Your immediate health check for campaign profitability. As ACoS decreases, your campaign becomes more efficient. However, a "low" ACoS isn't always good — if too low, you may be underbidding and missing volume. It must align with your gross margin.
What is ACoS (Advertising Cost of Sales)?
The percentage of direct sales from sponsored ads campaigns spent on advertising. Calculated as (Ad Spend ÷ Ad-Attributed Sales) × 100.
Why it matters: Your immediate health check for campaign profitability. As ACoS decreases, your campaign becomes more efficient. However, a "low" ACoS isn't always good — if too low, you may be underbidding and missing volume. It must align with your gross margin.
What is TACoS (Total Advertising Cost of Sales)?
Ad spend as a percentage of total revenue (organic + ad-attributed), not just ad-driven sales. Calculated as (Total Ad Spend ÷ Total Revenue) × 100.
Why it matters: Unlike ACoS, this includes organic sales. It measures overall advertising efficiency for your entire business. As your organic rank improves, TACoS should decrease, indicating ads are successfully driving organic traction.
What is ROAS (Return on Ad Spend)?
Revenue ÷ Ad Spend. The inverse of ACoS.
Why it matters: If your ACoS is 30%, your ROAS is ~3.33. Brands often set a target ROAS floor (e.g., 4x). It's a simpler metric for quick bid adjustments on high-traffic days like Prime Day.