The Guardians of the Universe are fictional characters from the DC Comics universe, primarily known for their role in the Green Lantern series. They are a group of powerful, blue-skinned beings who oversee the Green Lantern Corps, an intergalactic police force. The Guardians are responsible for maintaining peace and order across the universe, using their vast knowledge and abilities. These beings reside on the planet Oa, which serves as the headquarters for the Green Lantern Corps. The Guardians possess advanced technology and wield immense power, including the ability to create energy constructs. They guide and train Green Lanterns, who are chosen from various planets to protect their respective sectors of the universe.