F.C. Internazionale Milano, commonly referred to as Internazionale (pronounced[internatt͡sjoˈnaːle]) or simply Inter, and colloquially known as Inter Milan outside of Italy, is a professional Italian football club based in Milan, Lombardy. The club have played continuously in the top tier of the Italian football league system since its debut in 1909.
Inter's home games are played at San Siro, also known as the Stadio Giuseppe Meazza. The stadium, which is shared with rivals A.C. Milan, is the largest in Italian football, with a total capacity of 80,018. A.C. Milan are considered one of their biggest rivals, and matches between the two teams are known as Derby della Madonnina, one of the most followed derbies in football. As of 2010, Inter is the second-most supported team in Italy, and the sixth most-supported team in Europe. The club is one of the most valuable in Italian and world football. It was a founding member of the now-defunct G-14 group of Europe's leading football clubs.