Movies, also known as films, are a form of visual communication that uses moving pictures and sound to tell stories or inform viewers. The history of film began in the 1890s with the invention of motion picture cameras. Early films were under a minute long since technology limited longer productions. Some key events in film history include the establishment of early film studios in 1897 and the introduction of sound in 1927. Popular film industries include Hollywood, Bollywood, and Lollywood. Common movie genres are biopics, horror, comedy, action, historical, adventure, fantasy, and science fiction. While movies entertain and educate, some can also promote violence, waste time, or establish false notions.