Manchester United, informally known as MANU, is a professional football club based in Old Trafford, Greater Manchester, England. Founded in 1878, it is one of the most successful clubs in English football and has won a record 20 league titles, a joint-record 12 FA Cups, five League Cups, and a record 21 FA Community Shields. The club is the most valuable in the world, worth an estimated $3.8 billion.