Categoría Primera B, also known as Torneo Postobón for sponsorship reasons, is the second division football league in Colombia.
The league is divided into two six-month seasons and into two regional divisions of nine teams where each team plays the region's other eight teams both home and away. The top two teams in each conference advance to a playoff to decide the two teams who then advance to the final. The winner of the final secures a spot to play for promotion at the end of the year.
After the first season is over, the second season begins with the same teams and format. The season's winner plays the first season's winner in a two-legged final to decide the team who is going to get promoted to the Categoría Primera A. At the end of the year, the team with worst final standing in Primera A is relegated to Primera B.