What language does Bollywood primarily produce films in?

Regional Languages in Indian Cinema

Although Bollywood primarily produces Hindi-language films, the Indian film industry is diverse and includes many regional language films as well. Some of the most popular regional film industries include Tollywood, producing Telugu films; Kollywood, which focuses on Tamil films; Sandalwood, which primarily creates films in Kannada; and Mollywood, which produces Malayalam films. Additionally, Bengali, Marathi, Punjabi, Gujarati, and Bhojpuri films contribute significantly to the richness of Indian cinema. Many Indian actors from these regional industries have found success in Bollywood as well, bringing their linguistic versatility to the mainstream Hindi film industry.