Halo is a video game franchise created by Bungie, now owned and managed by Microsoft subsidiary, 343 Industries. Starting with Halo: Combat Evolved for Xbox in 2001, the franchise has grown into a multi-billion dollar empire spanning video games, books, television, and film.

Halo follows the story Master Chief John-117, a Spartan supersoldier, as he fights for humanity in an interstellar war against an alliance of aliens known as the Covenant. The original Halo trilogy consists of three video games developed by Bungie; Halo: Combat Evolved, Halo 2, and Halo 3. The Reclaimer Saga is the second trilogy of Master Chief, consisting of Halo 4, Halo 5: Guardians and the upcoming Halo: Infinite. Various spin-offs are under in the franchise too, including Halo 3: ODST, Halo: Reach, Halo Wars, and more.

Halo: The Master Chief Collection is Microsoft's complication of Halo experiences, bringing together mainline games and select spin-offs into a cohesive package.