Amazon PPC glossary
Ad group
An ad group is a folder inside a campaign that holds related ads and the keywords or products they target. It keeps related things together so you can see what is working.
Example
In your cutting board campaign, one ad group holds keywords about size, such as “large cutting board.” Another holds keywords about material, such as “bamboo cutting board.”
Where it matters most: Book 1, The Amazon PPC Clarity Guide, in the chapter “Campaign Architecture.”
Go deeper
The glossary gives you the one-line answer. The Amazon PPC Clarity Guide explains why it matters and what to do about it.