The Chilean Primera B is the second-tier professional soccer league in Chile. It was established in 1952 and has since played a crucial role in the development of Chilean football. The league consists of 16 teams competing for promotion to the top-flight Primera División. Unión San Felipe and Rangers de Talca are the most successful teams in the league's history, with multiple titles to their name. Interestingly, the Primera B has seen several teams from outside Chile participate, including teams from Bolivia and Peru in the past.