Brøndby IF is a Danish professional football (soccer) club based in the town of Brøndby, on the western outskirts of Copenhagen. The club is also known as Brøndbyernes Idrætsforening, or Brøndby and BIF for short. The club, founded in 1964 as a merger between two local Brøndby clubs, has won 10 national Danish football championship titles and five national Danish Cups, since the club joined the Danish top-flight football league in 1981. Brøndby is the most successful Danish club on the European scene, with a UEFA Cup semi-final the best ever Danish result in the European competitions. Furthermore the club was the first Danish club to qualify for the UEFA Champions League, during the 1998-99 tournament.