King Digital Entertainment plc, is a casual social gaming company that mainly develops app games and games on Facebook, and is the largest game developer on Facebook. The game developed by the company has a synchronization function, which means that the user's game progress can be switched from different platforms.

The main offices are located in Malta, Malmo, Bucharest, London (headquarters), San Francisco, Barcelona, Hamburg, and Stockholm. As of 2017, the number of employees is approximately 2,000.

On November 2, 2015, Activision Blizzard acquired the company for $5.9 billion in cash.