Football in India
National Football League, established in 1996 by governing body All India Football Federation (AIFF) was the first "semi-professional" football league in India. 
The League was renamed and restructured and the I-League was founded in 2006 after India's former top league the National Football League disbanded in a successful effort aimed at increasing the game in India. Links with clubs that were not in the I-League were maintained, and each season the bottom two clubs are relegated from the I-League and replaced by two from the I-League 2nd Division. The I-League is currently contested between 11 clubs. The Kolkata Derby in the I League (and other tournaments) played between Mohun Bagan and East Bengal is one of the most fierce rivalries in the world (featured in FIFA website) and one of the oldest derbies in the world (90 years). An average 80, 000 to 100, 000 supporters throng the stadium in this special fixture.
Football Sports Development
The Indian Super League was founded in October 2013 by IMG–Reliance, along with STAR Sports. The goal of the league was to make football a top sport in India, a country that only found success in cricket and hockey. The league was modelled along the lines of the popular Twenty20 cricket league, the Indian Premier League, and Major League Soccer of the United States. The league started in October 2014 with eight teams and ended in December 2014 with Atlético de Kolkata coming out as inaugural champions.