Rugby Union and Rugby League, often simply referred to as “rugby” and “league”, as the latter is the offshoot of the former, are two modes of rugby play.
Rugby Union has 15 players on the field, infinite tackles, and is more famous internationally.
Rugby League has 13 players, a limited about of tackles, and is predominantly famous in Australia, New Zealand, and the UK.
Further, the two types have different methods of counting points, and other small rules specific to each type of rugby.