Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, providing advertising content to a user in response to an image search request to be performed on the Internet. A search phrase is input to be used to perform the image search on the Internet. Searching of Internet content is performed to identify content matching the received search phrase. Images associated with each of the matching content are compared with images associated with advertisements stored in an advertisement database, to determine which advertisements have associated images related to any of the images associated with the matching content. Based on display data provided to the client computer, each of the matching content can thus be displayed at a client computer with associated images, along with an advertisement having an associated image related to any of the matching content.