<human>:  Why is the Indian film industry, also known as bollywood, called bollywood?
<bot>: The name bollywood is a portmanteau of Bombay and Hollywood. Bombay was the original name of Mumbai, the capital of India. Hollywood is the name of the city of Los Angeles, California, in the United States. Bollywood is the name of the Indian film industry, which is known for producing films in the Hindi language.