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The European Championship, commonly known as the UEFA Euro or simply Euro, is the main football competition contested by the senior men's national teams of the members of the Union of European Football Associations (UEFA). As of the latest edition of the tournament, the number of participating teams in the European Championship is 24. This means that 24 national teams from across Europe compete in the tournament to determine the continental champion.

Since its inception in 1960, the format of the European Championship has evolved. The number of participating teams increased from 4 in the inaugural edition to the current 24team format, which was first introduced in the 2016 tournament held in France. This expansion allowed more nations to participate and increased the competitiveness of the tournament.

The 24 participating teams in the UEFA Euro come from qualifying competitions held prior to the main tournament. UEFA member associations compete in a series of qualifying matches to secure a spot in the final tournament. The qualified teams then compete in the final tournament, which is hosted by one or multiple countries, as in the case of the upcoming Euro 2021, which will be held across multiple European cities.

Overall, the increase in the number of participating teams in the European Championship has made the tournament more inclusive, exciting, and competitive, providing football fans with a showcase of topquality international football from across Europe.