Bollywood is India's Hindi language film industry, based in the city of Mumbai. It is more formally referred to as Hindi cinema. The term "Bollywood" is often used by non-Indians however, Bollywood proper is only a part of the larger Indian film industry, which includes other production centers producing films in many other Indian languages.
Bollywood is the largest film producer in India, representing 45% of the net box office revenue, while Tamil and Telugu cinema represent 37%, and the rest of the regional cinema constitutes 21% as of 2017. Bollywood is also one of the largest centers of film production in the world. Furthermore, Bollywood is one of the biggest film industries in the world in terms of the number of people employed and the number of films produced.