Rugby sevens (commonly known as simply sevens and originally known as seven-a-side rugby) is a variant of rugby union in which teams are made up of seven players playing seven-minute halves, instead of the usual 15 players playing 40-minute halves. Rugby sevens is administered by World Rugby, the body responsible for rugby union worldwide. The game is popular at all levels, with amateur and club tournaments generally held in the summer months. Sevens is one of the most well distributed forms of rugby, and is popular in parts of Africa, Asia, Europe, and the Americas, and especially in the South Pacific.