Bollywood is the nickname for the Indian movie industry, which features movies in the Hindi language. It produces the most films in the world every year. Bollywood movies feature songs that add entertainment to the films, though they tend to not advance the plot. The most famous type of Bollywood movie is the "Masala" film, which focuses on entertainment and adventure. This type of movie tends to have huge commerical success, but gains little apperiation from critics.