Halo is a science-fiction video game series created by Bungie Studios. The series centers on the Master Chief, a cybernetically enhanced human super-soldier equipped with technologically advanced battle armor, and his artificial intelligence (AI) companion, Cortana, as the humans of a futuristic universe battle the Covenant, a theocratic alliance of alien races.

The video games, particularly Halo: Combat Evolved, have been praised as being among the best and most influential first-person shooters on a game console, with Halo being the Microsoft Xbox's "killer app." The franchise has expanded to include novels, several graphic novels, and numerous other licensed products. The cultural impact of the Halo series has been compared to that of the Star Wars franchise, with those who enjoy it being dubbed the "Halo Nation.”

This article uses material from the Wikipedia article "Halo (series)" and is licensed under the GNU Free Documentation License.