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Official Site: Bungie

Halo is a science fiction video game franchise created by Bungie and owned and published by Microsoft Game Studios. The main trilogy of games center on the experiences of the Master Chief, a cybernetically-enhanced human super-soldier, and his artificial intelligence (AI) companion, Cortana. The Master Chief aids future humanity in battling the Covenant, a theocratic alliance of alien races that worship an ancient civilization known as the Forerunners, and a parasitic organism known as the Flood. In this science fiction setting, the term "Halo" refers to Halo megastructures: large, habitable ringed structures, similar to the Orbitals in Iain M Banks' Culture novels, or to smaller versions of Larry Niven's Ringworld.

The trilogy of video games have been praised as being among the best first-person shooter on a video game console, and are considered the Microsoft Xbox's "killer app". This has led to the term "Halo killer" being used to describe console games that aspire, or are considered, to be better than Halo. Fueled by the success of Halo: Combat Evolved, and immense marketing campaigns from publisher Microsoft, both sequels went on to break various sales records. Halo 3 sold more than US$ million worth of copies in the first twenty-four hours of release, breaking the record set by Halo 2 three years prior. The games have sold over 34 million copies worldwide, and all Halo merchandise has grossed more than $1.7 billion.

Strong sales of the games has led to the franchise's expansion to other mediums; there are six bestselling novels, two graphic novel, and other licensed products. Beyond the original trilogy, other "Halo" games have branched off into other video game genre, including Halo Wars, a real-time strategy game produced as developer Ensemble Studios' last project. Bungie also contributed the expansion Halo 3: ODST and a prequel Halo: Reach, their last project for the franchise. Much of the series' award-winning music was composed by Martin O'Donnell and his partner Michael Salvatori; soundtracks have been released for all games in the series. The cultural impact of the Halo series has been compared by writer Brian Bendis to that of Star Wars. The collective group of fans of the series is referred to as the "Halo Nation". .

In the distant past, a race known as the Forerunners controlled the galaxy. The Forerunners used their advanced technology to protect life, but were caught off-guard by an alien parasite known as the Flood. The Flood, which spread through infestation of sentient life, threatened and overran many worlds in the galaxy before the Forerunners could attempt to contain the threat. A group of Forerunners conceived a final solution—using an installation known as the Ark, they built seven large ring-shaped megastructures known as Halos. The Halo Array, when activated, would destroy all sentient life in the galaxy—depriving the Flood of their food. Delaying as long as they could, the Forerunners finally activated the rings and disappeared.

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