Amazon FBA Glossary can seem overwhelming when you’re starting your journey as an Amazon seller. The platform uses hundreds of specialized terms, acronyms, and concepts that every successful seller needs to understand.
Whether you’re just getting started or looking to expand your knowledge, this comprehensive glossary will help you navigate the complex world of Amazon selling. From basic concepts like ASIN to advanced strategies like PPC optimization, we’ll break down every term you need to know.
TL;DR
- Amazon uses over 200 unique terms and acronyms that FBA sellers must understand to operate effectively.
- ASIN, SKU, and FNSKU are the three core identification numbers that track every product in Amazon’s system.
- Amazon charges 15+ different types of fees, including referral fees that range from 6% to 45% depending on category.
- Understanding terms like Buy Box, A9 algorithm, and conversion rate directly impacts your sales performance and profitability.
Amazon FBA Glossary – Essential Terms Every Seller Must Know
Amazon’s ecosystem operates on a complex system of terms, processes, and requirements that can make or break your selling success. Each term represents a specific function, fee, or strategy that directly impacts your bottom line.
This glossary covers everything from basic account setup terminology to advanced optimization strategies. We’ve organized the terms alphabetically and included practical explanations that show how each concept affects your daily operations as an Amazon FBA seller.
A-C Terms
A9 Algorithm
Amazon’s search algorithm that determines product ranking in search results. The A9 algorithm considers factors like sales velocity, conversion rate, relevance, and customer satisfaction to decide which products appear first when customers search.
ACOS (Advertising Cost of Sale)
The percentage of sales spent on advertising, calculated as ad spend divided by sales revenue. A lower ACOS means more profitable advertising campaigns.
AMS (Amazon Marketing Services)
Amazon’s advertising platform for sellers, now called Amazon Advertising. This platform allows you to create sponsored product ads, sponsored brand ads, and display ads to promote your products.
ASIN (Amazon Standard Identification Number)
A unique 10-character identifier assigned to every product on Amazon. ASINs help Amazon track inventory and allow customers to find specific products easily.
Brand Registry
Amazon’s program that helps brand owners protect their intellectual property and enhance their brand presence. Enrolled brands get access to additional tools like A+ Content and Brand Analytics.
BSR (Best Sellers Rank)
A ranking system that shows how well a product sells within its category compared to other products. Lower BSR numbers indicate better sales performance.
Buy Box
The prominent “Add to Cart” section on a product detail page where customers can purchase the item. Winning the Buy Box is important for sales since most purchases happen through this feature.
Category Gating
Amazon’s restriction system that requires sellers to get approval before selling in certain categories. Gated categories like beauty, grocery, and jewelry require additional documentation or performance standards.
Conversion Rate
The percentage of visitors to your product listing who make a purchase. Higher conversion rates improve your search ranking and overall profitability.
D-H Terms
FBA (Fulfillment by Amazon)
Amazon’s service where they store, pack, and ship your products to customers. FBA also handles customer service and returns for your products, making it easier to scale your business.
FBM (Fulfillment by Merchant)
A fulfillment method where sellers handle their own storage, packing, and shipping. FBM gives you more control over the customer experience but requires more hands-on management.
FNSKU (Fulfillment Network Stock Keeping Unit)
A barcode that Amazon assigns to your products for FBA inventory tracking. Each FNSKU is unique to your seller account and specific product, ensuring proper inventory management.
Hazmat
Products classified as hazardous materials that require special handling and storage. Hazmat items have additional fees and restrictions for FBA storage and shipping.
Pro Tip for New Sellers
Focus on mastering 10-15 core terms first before diving into advanced concepts. Understanding ASIN, SKU, BSR, and Buy Box will give you the foundation needed for day-to-day operations.
I-O Terms
IPI (Inventory Performance Index)
Amazon’s scoring system that measures how efficiently you manage your FBA inventory. Low IPI scores can result in storage limits or additional fees.
Keyword Harvesting
The process of identifying high-performing search terms from your advertising campaigns to optimize product listings. Effective keyword harvesting improves organic search rankings and reduces advertising costs.
Lightning Deal
A time-limited promotional offer that appears on Amazon’s deals pages. Lightning deals can significantly boost sales volume and product visibility during the promotional period.
Long-tail Keywords
Specific, multi-word search phrases that have lower competition but higher conversion rates. These keywords often represent customers who know exactly what they want to buy.
MSKU (Merchant Stock Keeping Unit)
Your internal product identifier that you assign when creating a product listing. MSKUs help you track inventory and organize your catalog according to your business needs.
ODR (Order Defect Rate)
The percentage of orders that receive negative feedback, A-to-Z claims, or credit card chargebacks. Amazon requires sellers to maintain an ODR below 1% to remain in good standing.
P-S Terms
PPC (Pay-Per-Click)
Amazon’s advertising system where you pay each time someone clicks on your ad. PPC campaigns are essential for driving traffic to new products and maintaining visibility for established listings.
Private Label
Products manufactured by third parties but sold under your own brand name. Private labeling allows you to create unique products and build brand recognition without manufacturing facilities.
Product Bundling
Combining multiple related products into a single listing to increase order value and differentiate from competitors. Bundles often perform well because they offer convenience and perceived value to customers.
Referral Fee
Amazon’s commission on each sale, which varies by product category. Most categories charge between 8-15%, but some specialized categories can charge up to 45% of the sale price.
Seller Central
Amazon’s web interface where sellers manage their accounts, create listings, track performance, and handle customer communications. This platform serves as your command center for all selling activities.
SKU (Stock Keeping Unit)
A unique identifier that you assign to track your products and inventory. SKUs help organize your catalog and connect your internal systems with Amazon’s platform.
Sponsored Products
Amazon’s most common advertising format that promotes individual products in search results and product pages. These ads appear alongside organic search results and use a cost-per-click pricing model.
T-Z Terms
Throttling
Amazon’s practice of limiting how quickly new sellers can increase their inventory or sales volume. This system helps prevent fraud and ensures sellers can handle their growth responsibly.
UPC (Universal Product Code)
A standardized barcode system used to identify products globally. Most products require valid UPCs to create Amazon listings, though some categories accept other identifier types.
Variation Listings
Product listings that group similar items with different attributes like size, color, or style under one parent listing. Variations help customers compare options and can improve conversion rates.
Velocity
The speed at which your products sell, typically measured in units per day or week. Higher velocity indicates strong demand and can improve your search ranking and Buy Box eligibility.
Wholesale
Purchasing products directly from manufacturers or authorized distributors to resell on Amazon. Wholesale sourcing often requires larger upfront investments but can offer better profit margins than retail arbitrage.
Frequently Asked Questions
What are the most important Amazon FBA terms for beginners?
New sellers should focus on ASIN, SKU, FNSKU, BSR, Buy Box, FBA fees, and conversion rate. These terms cover the essential concepts needed for daily operations and basic success metrics.
How many different fees does Amazon charge FBA sellers?
Amazon charges over 15 different types of fees including referral fees, FBA fulfillment fees, storage fees, removal fees, and various penalty fees. Understanding these costs is essential for profitable pricing strategies.
What’s the difference between ASIN and SKU?
ASIN is Amazon’s unique identifier for each product listing, while SKU is your internal identifier for tracking inventory. One ASIN can have multiple SKUs if different sellers offer the same product.
Why do some Amazon terms have multiple meanings?
Amazon’s platform has evolved over many years, and some terms have expanded or changed meaning. Context usually makes the intended meaning clear, but staying updated with current definitions helps avoid confusion.
Final Thoughts
Amazon FBA Glossary terms form the foundation of successful selling on the platform. Mastering these concepts will help you communicate effectively with other sellers, understand Amazon’s policies, and make informed business decisions.
Start with the most common terms you’ll encounter daily, then gradually expand your vocabulary as your business grows. Understanding these terms will accelerate your learning curve and help you avoid costly mistakes that trip up many new sellers.
Ryan Conlon, a seasoned entrepreneur and e-commerce expert dedicated to helping resellers thrive in the dynamic world of Amazon FBA. With years of hands-on experience and a passion for sharing knowledge, Ryan is your trusted guide on the journey to reselling success. His commitment to providing valuable insights, strategic tips, and actionable advice is the driving force behind FBAresellers.com
