The Summer Olympic Games (Jeux olympiques d'été), also known as the Games of the Olympiad, and often referred to as the Summer Olympics, is a major international multi-sport event normally held once every four years. The inaugural Games took place in 1896 in Athens, Greece, and the most recent Games were held in 2021 in Tokyo, Japan. The International Olympic Committee (IOC) is responsible for organising the Games and for overseeing the host city's preparations. The tradition of awarding medals began in 1904; in each Olympic event, gold medals are awarded for first place, silver medals for second place, and bronze medals for third place. The Winter Olympic Games were created out of the success of the Summer Olympic Games, which are regarded as the largest and most prestigious multi-sport international event in the world.
The Summer Olympics have increased in scope from a 42-event competition programme in 1896 with fewer than 250 male competitors from 14 nations, to 339 events in 2021 with 11,420 competitors (almost half of whom were women) from 206 nations. The Games have been held in nineteen countries over five continents: four times in the United States (1904, 1932, 1984, and 1996); three times in Great Britain (1908, 1948, and 2012); twice each in Greece (1896 and 2004), France (1900 and 1924), Germany (1936 and 1972), Australia (1956 and 2000), and Japan (1964 and 2020); and once each in Sweden (1912), Belgium (1920), the Netherlands (1928), Finland (1952), Italy (1960), Mexico (1968), Canada (1976), the Soviet Union (1980), South Korea (1988), Spain (1992), China (2008), and Brazil (2016).
London was the first city to host the Summer Olympic Games three times. , Paris, Los Angeles, Athens and Tokyo have each hosted twice; Paris will host for the third time in 2024, followed by Los Angeles which will host the Games in 2028. Only five countries have participated in every Summer Olympic Games: Australia, France, Great Britain, Greece, and Switzerland.