Foursquare is a location-based social networking app that allows individuals to personalize local Internet searches and off-line, real-world experiences. Offering tracking of the whereabouts of people as they travel, play, conduct business, or shop, the mobile app has become a tool that its users rely on and visit regularly. The recommendations Foursquare provides are unique to the individual and inform them as to where to find the items and locations they are most likely to enjoy. Encouraging the shaping of social relationships, the app connects people according to the places they visit and other common attributes. This entry provides an overview of Foursquare, including its origins, its features, and its evolution as a data provider to businesses worldwide.