The Amazon seller’s glossary

A+ Content is Amazon's enhanced product description format for brand-registered sellers, replacing the plain text block with designed image and text modules.

Advertising Cost of Sale (ACoS) is the share of advertising-driven revenue you spend on advertising, worked out as ad spend ÷ ad sales × 100.

Amazon PPC (pay-per-click), mainly Sponsored Products, is Amazon's advertising system where you bid to show ads in search results and pay only when a shopper clicks.

An ASIN (Amazon Standard Identification Number) is the unique 10-character code Amazon assigns to every product in its catalogue.

Amazon Brand Registry is the programme that gives trademark owners control over their brand's listings plus tools for protection, advertising, and analytics.

Break-even ACoS is the advertising cost of sale at which an ad-driven sale makes zero profit, equal to your profit margin before ad spend.

Best Sellers Rank (BSR) is the number Amazon assigns to a product to show how well it sells within its category, where 1 is the best-selling item.

The Buy Box is the 'Add to Cart' and 'Buy Now' section of a listing, and the seller who wins it gets the sale when a shopper clicks buy.

Cost of Goods Sold (COGS) is what it costs you to produce or buy the units you actually sold in a period, before marketplace fees and advertising.

Dropshipping is a retail model where you sell products without holding inventory: when a customer orders, your supplier ships the item directly to them.

Fulfilment by Amazon (FBA) is Amazon's service where you ship inventory to Amazon's warehouses and they handle storage, packing, shipping, returns, and customer service.

FBA reimbursements are refunds Amazon owes sellers when inventory is lost, damaged, or mis-charged inside Amazon's fulfilment network.

Fulfilled by Merchant (FBM) is the model where you list on Amazon but store, pack, and ship every order yourself instead of using Amazon's warehouses.

The honeymoon period is the informal name for a new Amazon listing's early weeks, when the algorithm gives it extra visibility while it gathers performance data.

The Inventory Performance Index (IPI) is Amazon's 0 to 1,000 score for how efficiently an FBA seller manages inventory, based on excess stock, sell-through, stranded inventory, and in-stock rates.

Landed cost is the full per-unit cost of getting a product to the point where it can be sold: factory price plus freight, duties, insurance, and handling.

Lead time is the total time between placing an order with a supplier and having sellable stock, covering production, shipping, and check-in.

Listing hijacking is when another seller attaches their offer to your Amazon listing, usually with a counterfeit or lookalike product, and competes for its Buy Box.

Minimum Order Quantity (MOQ) is the smallest number of units a supplier is willing to sell in one order.

Niche Score is LumaiScope's proprietary 0 to 100 rating of how attractive a product niche is, weighing real demand against competition and barriers to entry.

Organic rank is a product's unpaid position in Amazon's search results for a given keyword, driven by relevance and sales performance rather than ad spend.

Private label is the model where you manufacture a generic product under your own brand and sell it as a unique listing, rather than reselling someone else's brand.

Profit margin is the percentage of the selling price you keep after costs, calculated as profit ÷ revenue × 100, with gross and net versions depending on which costs you subtract.

The referral fee is Amazon's commission on each sale, charged as a percentage of the total sale price, with the rate set by product category.

A reverse ASIN lookup takes a product's ASIN and returns the keywords it ranks or advertises for, which effectively reads a competitor's keyword strategy.

Sell-through rate is the share of your available inventory that sells over a period, worked out as units sold ÷ units available × 100, and it gauges how fast stock moves.

Total Advertising Cost of Sale (TACoS) measures ad spend against total revenue, both advertising and organic sales, rather than ad-driven sales alone.