I can give you along explanation about this. lol im sorta obsessed with halo. but ill spare you and give you a short one.
The Halo's were built to destroy the Flood. These things called the forunners created the halos as a last resort. what the halos do is kill all life across the universe for billions of miles, so it makes the flood starve to death.
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halo is a circle or ring angels have halo's above their heads in halo... the game you are trying to destroy the BIG RING THING in the sky... Halo
if ur saying what is halo is a massive ring a saycrid ring with life on it like trees and stuff it can be used as a super weapon that can blow up planets and is very dangerous the covernaunt (the aliens) try to blow up earth.
An angel's halo is the ring like crown you see hovering above their head. It apparently symbolizes their position as a messenger of God or a being from Heaven. Halos are supposedly divine symbols only worn by true good doers. But if your referring to a Halo Ring that would be a weapon of mass destruction in a video game.
An ancient race that built the Halo rings and the Ark in order to starve the flood. It is revealed by 343 Guilty Spark that humans are descendants of the Forerunners.
after Halo reach,there is no more In total, there is :Halo 1,Halo 2, Halo 3, Halo ODST, Halo wars and Halo reach