"The Matrix is a science fiction action franchise created by Andy and Larry Wachowski and distributed by Warner Bros. Pictures. The series began with the 1999 film The Matrix and later spawned two sequels; The Matrix Reloaded and The Matrix Revolutions, both released in 2003, thus forming a trilogy. The characters and settings of the Matrix fictional universe are further explored in other media, including animation, comic books, and video games.
The series depicts a cyberpunk story incorporating numerous references to philosophical and religious ideas. Other influences include mythology, anime, and Hong Kong action films (particularly "heroic bloodshed" and martial arts movies)."
On May 15, 2003, the game Enter the Matrix was released in North America concurrently with The Matrix Reloaded. The first of three video games related to the films, it told a story running parallel to The Matrix Reloaded and featured scenes shot during the filming of The Matrix Reloaded and The Matrix Revolutions.
Two more Matrix video games were released in 2005. The MMORPG The Matrix Online continued the story beyond The Matrix Revolutions, while The Matrix: Path of Neo allowed players to control the series' protagonist Neo in scenes from the film trilogy.
Source: Wikipedia, "The Matrix (franchise)", available under the CC-BY-SA License.