1. A computer-implemented method, comprising: receiving, by a computing system, a search request that identifies an image; comparing, by the computing system, the image that is identified by the search request to multiple candidate images in order to identify a particular image of the multiple candidate images that matches the image that is identified by the search request; identifying, by the computing system, a keyword that has been determined to be relevant to the particular image of the multiple candidate images; and providing, by the computing system in response to the computing system having received the search request that identifies the image, multiple search results that are responsive to the keyword, wherein providing the multiple search results that are responsive to the keyword is performed by the computing system without user intervention after the computing system receives the search request.