Halo is a first-person shooter video game series developed by Bungie and 343 Industries, and published by Xbox Game Studios. The series centers around an interstellar war between humanity and an alliance of aliens known as the Covenant. The main protagonist of the series is Master Chief, a genetically enhanced supersoldier, who battles the Covenant and other threats to humanity. The series has been widely praised for its story, gameplay, and multiplayer features. It is considered one of the most successful and influential video game franchises of all time.