Ad Auction

An ad auction occurs every time a user enters a search query to decide which ads will be shown and and in what order.

Definition

An ad auction occurs every time a user enters a search query to decide which ads will be shown and in what order. The ad auction determines what keywords match the search query and finds the eligible associated ads, then decides which ads to show based on ad rank. Each ad auction may have different results based on the competition in that moment. It is normal for your cost per click and ad position to fluctuate.