The English word ‘relegation’ should not be confused with the German word ‘Relegation’.
In English at the end of, for example, a football season, a number of teams at the bottom end of the table are relegated to the lower league. In other words they move down to a lower league.
Teams in the lower league that performed well and ended up at the top end of their table are promoted to the higher league.
Some teams are promoted automatically. Other teams have to play further matches to decide who goes up. This process is called the ‘play-off(s)’ and not ‘relegation’ as I often hear in Germany.
E.g. The play-offs usually start in the middle of May.
The play-off final is on Sunday.
Have fun learning English!
Louise