Swarm is a social networking app developed by Foursquare. It was designed as a way for users to share their location and activities with friends, as well as discover new places and things to do in their area.
Users can check in at different locations, leave tips and recommendations for other users, and see what their friends are doing and where they are. The app also includes a feature called "Mayor Mode," which allows users to compete with their friends to become the "Mayor" of a particular location by checking in the most times.
Swarm also includes a feature called "Stickers," which allows users to express themselves by adding fun, animated stickers to their check-ins.
Overall, Swarm is a social networking app that provides users with a fun and easy way to stay connected with friends, discover new places, and share their experiences.