What is characteristic for Bollywood films?

Explanation

Bollywood is the nickname for the part of the Indian film industry that is based in Mumbai. The name Bollywood is a contraction of Bombay (the city of Mumbai used to be called Bombay) and Hollywood. Not all Indian films are Bollywood-films. Tamil, Bengal and Telugu films are not, for instance, whilst Hindi films are. The term is popularly used about Hindi films contained lots of dance and singing.