The term "Forerunner" often refers to an advanced ancient civilization in the popular video game series Halo. This civilization is known for its remarkable technology and architecture, which includes massive structures and powerful weapons. The Forerunners played a crucial role in the galaxy's history, particularly in their interactions with other species, including the Humans and the Flood. In the lore of Halo, the Forerunners are depicted as guardians of the galaxy, tasked with maintaining peace and order. Their most significant achievement is the creation of the Halo rings, massive installations designed to combat the Flood threat. The Forerunners' legacy continues to influence the events and characters within the series.