Sport Lisboa e Benfica, commonly known as SL Benfica or simply Benfica, is a Portuguese professional football and multi-sport club based in Lisbon, Portugal. Founded on 28 February 1904 under the name Sport Lisboa, the organisation adopted its present identity following its merger with Grupo Sport Benfica in 1908. Benfica is one of Portugal's most prominent sporting institutions and has a long history of achievements in domestic and international competitions. Its professional men's football team competes in the Primeira Liga and plays its home matches at the Estádio da Luz, officially known as Estádio do Sport Lisboa e Benfica. The stadium has a capacity of approximately 65,000 spectators and is one of the largest football venues in Portugal. Benfica has won numerous Portuguese league championships, domestic cups and European trophies, including two European Cup titles. The organisation operates an extensive multi-sport structure covering football, basketball, handball, volleyball, futsal, roller hockey, swimming, gymnastics and other sporting disciplines. Its women's football department has also developed into an important part of the club's sporting activities. Benfica is particularly recognised for its youth development system, operated through Benfica Campus in Seixal. The academy has developed several internationally recognised footballers and provides structured training, education and performance programmes for young athletes. The club also maintains a large membership base and an extensive international supporter community, particularly among Portuguese communities worldwide. Its activities extend beyond professional sport into media, commercial partnerships, merchandising, community engagement and social responsibility. Benfica promotes initiatives involving education, inclusion, health and social development through its wider organisational structure and foundation-related activities. The club's headquarters are located at Avenida Eusébio da Silva Ferreira, Lisbon. With its traditional red-and-white colours, eagle emblem, historic achievements and broad sporting structure, SL Benfica remains a major institution in Portuguese and European sport.