Hollywood is the informal term popularly used for the American film industry based in Hollywood, California, USA.
The cinema of the United States has had a profound effect on cinema across the world since the early 20th century. Its history is sometimes separated into four main periods: the silent film era, classical Hollywood cinema, New Hollywood, and the contemporary period (after 1980). Since the 1920s, the American film industry has grossed more money every year than that of any other country.

In 1878, Eadweard Muybridge demonstrated the power of photography to capture motion. In 1894, the world's first commercial motion picture exhibition was given in New York City, using Thomas Edison's Kinetoscope. The United States was in the forefront of sound film's development in the following decades. Since the early twentieth century, the U.S. film industry has largely been based in and around Hollywood, Los Angeles, California. Picture City, FL was also a planned site for a movie picture production center in the 1920s, but due to the 1928 Okeechobee hurricane, the idea collapsed and Picture City was returned back to the original name of Hobe Sound. Director D. W. Griffith was central to the development of film grammar and Orson Welles's Citizen Kane (1941) is frequently cited in critics' polls as the greatest film of all time.

American screen actors like John Wayne and Marilyn Monroe have become iconic figures, while producer/entrepreneur Walt Disney was a leader in both animated film and movie merchandising. The major film studios of Hollywood are the primary source of the most commercially successful movies in the world, such as Gone with the Wind (1939), Star Wars (1977), Titanic (1997), and Avatar (2009).

Today, American film studios collectively generate several hundred movies every year, making the United States the third most prolific producer of films in the world the first being India and the second being Nigeria