Glossary

Amazon Seller Glossary

Clear definitions of the Amazon advertising and seller terms that matter — each with how AIAdKing handles it in practice.

Last updated: June 2026

ACoS Advertising Cost of Sales

ACoS (Advertising Cost of Sales) = ad spend ÷ ad revenue × 100. It measures how much you spend on Amazon ads to make one rupee (or dollar) o...

TACoS (Total Advertising Cost of Sales) = ad spend ÷ total revenue × 100. Unlike ACoS, it measures ad spend against all sales — organic incl...

RoAS (Return on Ad Spend) = ad revenue ÷ ad spend. It is the inverse of ACoS: a 4× RoAS is the same as a 25% ACoS. RoAS expresses ad efficie...

The Amazon Buy Box (now “Featured Offer”) is the “Add to Cart” box that wins the default sale on a product page. When several sellers offer...

Dayparting on Amazon means adjusting ad bids or budgets by hour of day and day of week, so you bid more when shoppers convert and less when...

Amazon negative keywords are search terms you block so your ads stop showing for them. Adding a search term that gets clicks but no sales as...

The SP-API (Selling Partner API) is Amazon’s official developer API for seller data and actions — orders, listings, inventory, finance and m...

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