...The Matrix Online launched on March 22, 2005, and while it would shut down just over four years later, it’s an integral part of the universe of the Matrix mythos. More than just a film series, The Matrix was conceived as a multimedia project spanning live-action and animated films, comic books, and video games. Plenty of films have had video game tie-ins before and after The Matrix, but The Matrix Online goes further, establishing itself as a canonical sequel to the films....
source:
https://www.inverse.com/gaming/the-matrix-online-anniversary