The Challenge League is a professional football league in Switzerland, serving as the second tier of the Swiss football league system. It features teams that compete for promotion to the top-tier league, known as the Swiss Super League. The league typically consists of 10 to 12 teams, and the season runs from summer to spring, with each team playing home and away matches. Teams in the Challenge League aim to secure a top position to gain promotion, while the lower-ranked teams face the risk of relegation to the Promotion League, the third tier. The league is known for its competitive nature and serves as a platform for developing talent in Swiss football.