Uefa Nations League
In short
An international football competition for European national teams designed to replace traditional friendly matches with competitive league play. It uses a system of tiers where teams can win promotion or face relegation based on their performance.
In plain words
Instead of playing random friendly games, European countries play in groups against teams of a similar skill level. This makes every match more important because winning helps a team move up to a higher league.
A simple example
If a small nation performs very well in League C, they earn promotion to play against stronger teams in League B during the next season.
Why it matters
It provides more meaningful matches for fans and helps smaller nations gain experience against comparable opponents. It also creates a structured way to prepare for major tournaments like the Euros.
Easy to mix up
Do not confuse it with the UEFA European Championship, which is a knockout tournament held every four years.