The Union Cycliste Internationale (UCI), the governing body of cycling, categorises teams into three divisions. The top 18 teams are the UCI WorldTeams and compete in the UCI World Tour. The second and third divisions respectively are the Professional Continental teams and the Continental teams. The teams compete in the UCI Continental Circuits, which are divided into five continental zones: Africa, America, Asia, Europe and Oceania. They also win points in the UCI World Ranking. Professional Continental teams are also invited to participate in events in the UCI World Tour, although they are not eligible to win points in the World Tour rankings. (en)