Colo-Colo, officially Club Social y Deportivo Colo-Colo, is a Chilean professional football club based in Macul, Santiago. Founded in 1925 by David Arellano, it competes in the Chilean Primera División, from which the club has never been relegated. The team has played its home games at Estadio Monumental David Arellano since 1989. Colo-Colo is regarded as the most successful club in Chilean football.