Association football
International competitions

International competitions in association football principally consist of two varieties: competitions involving representative national teams or those involving clubs based in multiple nations and national leagues. International football, without qualification, most often refers to the former. In the case of international club competition, it is the country of origin of the clubs involved, not the nationalities of their players, that renders the competition international in nature.

The major international competition in football is the World Cup, organised by FIFA. This competition has taken place every four years since 1930, with the exception of the 1942 and 1946 tournaments, which were cancelled because of World War II. As of 2022, over 200 national teams compete in qualifying tournaments within the scope of continental confederations for a place in the finals. The finals tournament, held every four years, involved 32 national teams (expanding to 48 teams for the 2026 tournament) competing over a four-week period. The World Cup is the most prestigious association football tournament as well as the most widely viewed and followed sporting event in the world, exceeding even the Olympic Games; the cumulative audience of all matches of the 2006 FIFA World Cup was estimated to be 26.29 billion with an estimated 715.1 million people watching the final match, one-ninth of the entire population of the planet. The 1958 World Cup saw the emergence of Pelé as a global sporting star, a period that coincided with "the explosive spread of television, which massively amplified his presence everywhere". The current champions are Argentina, who won their third title at the 2022 tournament in Qatar. The FIFA Women's World Cup has been held every four years since 1991. Under the tournament's current format that was expanded in 2023, national teams vie for 31 slots in a three-year qualification phase, while the host nation's team enters automatically as the 32nd slot. The current champions are Spain, after winning their first title in the 2023 tournament.

There has been a football tournament at every Summer Olympic Games since 1900, except at the 1932 games in Los Angeles when FIFA and the IOC had disagreed over the status of amateur players. Before the inception of the World Cup, the Olympics (especially during the 1920s) were the most prestigious international event. Originally, the tournament was for amateurs only. As professionalism spread around the world, the gap in quality between the World Cup and the Olympics widened. The countries that benefited most were the Soviet Bloc countries of Eastern Europe, where top athletes were state-sponsored while retaining their status as amateurs. Between 1948 and 1980, 23 out of 27 Olympic medals were won by Eastern Europe, with only Sweden (gold in 1948 and bronze in 1952), Denmark (bronze in 1948 and silver in 1960) and Japan (bronze in 1968) breaking their dominance. For the 1984 Los Angeles Games, the IOC allowed professional players to compete. Since 1992, male competitors must be under 23 years old, although since 1996, three players over the age of 23 have been allowed per squad. A women's tournament was added in 1996; in contrast to the men's event, full international sides without age restrictions play the women's Olympic tournament.

After the World Cup, the most important international football competitions are the continental championships, which are organised by each continental confederation and contested between national teams. These are the European Championship (UEFA), the Copa América (CONMEBOL), the African Cup of Nations (CAF), the Asian Cup (AFC), the CONCACAF Gold Cup (CONCACAF) and the OFC Men's Nations Cup (OFC). These competitions are not strictly limited to members of the continental confederations, with guest teams from other continents sometimes invited to compete. The FIFA Confederations Cup was contested by the winners of all six continental championships, the current FIFA World Cup champions, and the country which was hosting the next World Cup. This was generally regarded as a warm-up tournament for the upcoming FIFA World Cup and did not carry the same prestige as the World Cup itself. The tournament was discontinued following the 2017 edition with its calendar slot replaced by an expanded FIFA Club World Cup. The UEFA Nations League and the CONCACAF Nations League were introduced in the late 2010s to replace international friendlies during the two-year cycle between major tournaments.

The most prestigious competitions in club football are the respective continental championships, which are generally contested between national champions, for example, the UEFA Champions League in Europe and the Copa Libertadores in South America. The winners of each continental competition contest the FIFA Club World Cup.
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