For questions about Halo, a video game franchise owned by Microsoft Studios, centring on an interstellar war between humanity and the Covenant, a theocratic alien alliance. Many of the games feature a cybernetically-enhanced human super-soldier, Master Chief John-117, and his AI companion, Cortana. "Halo" refers to Halo megastructures—large, habitable ringed structures similar to Orbitals in Banks's Culture novels, or Niven's Ringworld.

Halo logo

Halo is a multi-billion dollar video game franchise created by Bungie and now managed by 343 Industries and owned by Microsoft Studios. The series has been praised as being among the best first-person shooters on a video game console, and is considered the Microsoft Xbox's "killer app". As a highly popular video game series with a large and active fan base, the Halo trilogy has given rise to an array of video productions in an emerging entertainment medium, machinima.

The series centres on a 26th-century interstellar war between humanity and a theocratic alliance of aliens known as the Covenant. The Covenant are led by their leaders known as Prophets and worship an ancient civilization known as the Forerunners, who perished in combat with the Flood, an infectious alien parasite. Many of the games feature the experiences of Master Chief John-117, a cybernetically-enhanced human super-soldier, and his artificial intelligence companion, Cortana.

The term "Halo" refers to the Halo megastructures: large, habitable Dyson Rings, similar to the Orbitals in 's novels, or the of . They are referred to as "Installations" by their AI monitors, and are collectively referred to as "the Array" by their creators, the Forerunners. The Covenant refer to the structures as the 'Sacred Rings', which they want to activate as part of a greater religious prophecy known as 'The Great Journey'. According to Halo's fiction, the Forerunners built the rings to contain and study the Flood; the rings also act together as a weapon of last resort: when fired, the rings kill any sentient life capable of falling prey to the Flood, starving the parasite of its food.

Further reading

Sources: Halo (series) and Halo (megastructure) on the English Wikipedia.