1. One or more computer-readable media storage devices storing computer-executable instructions that, when executed, cause one or more processors to perform acts comprising: obtaining web documents based at least in part on a search term; extracting a plurality of entities and entity relationships from the web documents, each of the plurality of entities related to, but distinct from, the search term; displaying at a display device in communication with the one or more processors, representations indicating each of the plurality of entities; displaying at the display device, edges to define pairs of the displayed representations, the edges indicated by the entity relationships; displaying at the display device, a representation of the search term and edges from the representation of the search term to each of the representations of the plurality of entities; receiving user input indicating an edge between representations of two particular entities; and displaying, at the display device, a description of a relationship between the two particular entities in response to the received user input.