Google has attempted to replicate its success in search ad sales with a television ad product available to advertisers on a limited number of cable and satellite providers. The search giant sells the ad inventory in an online auction, similar to how it sells search advertising.
Recently, Google announced that it would provide advertisers using its tv ads product with data about the frequency of search terms over time in order to allow those advertisers to air their television campaigns during periods when viewers have a heightened interest. For example, advertisers selling a widget that has a particular seasonal appeal because more people are searching Google for that widget during a limited time will have access to that information, and Google will encourage them to increase the frequency of their TV advertising during that period.
Google started selling television ads in 2008. Since that time, the company has ended experiments selling radio and newspaper advertising.