Promotion and relegation in football leagues work by teams being moved between different divisions based on their performance in a given season.
In most football league systems, the bottom teams in the top division are relegated to the lower division for the following season, while the top teams in the lower division are promoted to the higher division. This system allows for teams to move up or down the league pyramid based on their results, creating an opportunity for smaller clubs to advance to higher levels and for underperforming teams to be demoted.