Overwatch is a team-based multiplayer online first-person shooter video game developed and published by Blizzard Entertainment. It was released in May 2016 for Windows, PlayStation 4, and Xbox One. Overwatch assigns players into two teams of six, with each player selecting from a roster of over 20 characters, known in-game as "heroes", each with a unique style of play, whose roles are divided into four general categories: Offense, Defense, Tank, and Support.