The EuroLeague is the highest level tier and most important professional club competition between basketball teams in Europe, with teams from up to 18 different countries, from members of FIBA Europe, mostly consisting of teams from ULEB member national domestic leagues. The EuroLeague's records for individual players, coaches, and teams have been set over two different eras of the competition. The league's first era, when the competition was organized by FIBA, and the league's second era, organized by EuroLeague Basketball.