The world records in swimming are ratified by World Aquatics, the international governing body of swimming. Records can be set in long course or short course swimming pools. World Aquatics recognizes world records in the following events for both men and women, except for the mixed relays, where teams consist of two men and two women, in any order.Freestyle: 50m, 100m, 200m, 400m, 800m, 1500m Backstroke: 50m, 100m, 200m Breaststroke: 50m, 100m, 200m Butterfly: 50m, 100m, 200m Individual medley: 100m, 200m, 400m Relays: 4 × 50 m freestyle relay, 4 × 100 m freestyle, 4 × 200 m freestyle, 4 × 50 m medley relay, 4 × 100 m medley Mixed relays: 4 × 50 m mixed freestyle, 4 × 100 m mixed freestyle, 4 × 50 m mixed medley, 4 × 100 m mixed medley