The UEFA Nations League is a biennial football competition organized by the Union of European Football Associations (UEFA) for the men's national teams of its member associations. It was introduced to provide more competitive matches and to replace friendly games with meaningful fixtures. The tournament features a league format, where teams are divided into groups and compete for promotion and relegation. The top teams from each league qualify for the Nations League Finals, culminating in a knockout stage to determine the champion. This innovative format has added excitement and intensity to international football.