On the game halo what is the halo?

Answer:
Halo is what they call the giant ringlike structure that is alot like Earth but has the land and ground on the inner side of the ring. It is both a habitarium and a weapon, as well as a containment facility to study the Flood. The Flood is the entire reason the Halos are Built, as they are designed as a last resort weapon, to prevent the spread of the flood by killing all food sources. Halo's creators, the Forerunners have died upon it's activation.
First answer by Killer12345. Last edit by Joshuayeung. Contributor trust: 16 [recommend contributor recommended]. Question popularity: 1 [recommend question].