Rugby football is a sport people play in many countries. It is usually called rugby or rugger.
Rugby football is named after Rugby School, the public school in England where it was developed. Legend has it that one day in 1823, a senior boy called William Webb Ellis elected to run with the ball rather than retiring to kick it as was the normal mode of play in Rugby School football matches. "Running in" was considered a bit like cheating then but was later accepted in the laws of Rugby Football (first published in 1846).