Ad Group
An ad group is a set of individual advertisements that are grouped together within a paid search campaign. Ad groups are created to organise and manage a group of ads that share similar themes, targeting, and landing pages.
The primary purpose of ad groups is to organise and structure a PPC campaign in a logical and easy-to-understand way. This allows advertisers to focus their efforts on specific themes, products, or services, and to target their ads to specific groups of users.