Ad group
From The Yaffe Center
An ad group contains one or more ads as well as keywords. When searcher enters a query that is similar to or contains a keyword within the ad group, the ad group is determined to be relevant. Relevance improves quality score which in turn affects ad rank. If the quality score is high enough the search engine will show an ad within the ad group. One keyword bid can be placed for each keyword in an ad group, or different bids can be placed for individual keywords within the ad group.