Action film is a film genre in which the protagonist or protagonists end up in a series of challenges that typically include violence, extended fighting, physical feats, and frantic chases. Action films tend to feature a resourceful hero struggling against incredible odds, which include life-threatening situations, a villain, or a pursuit which generally concludes in victory for the hero.
Advancements in CGI have made it cheaper and easier to create action sequences and other visual effects that required the efforts of professional stunt crews in the past. However, reactions to action films containing significant amounts of CGI have been mixed as films that use computer animations to create unrealistic, highly unbelievable events are often met with criticism. While action has long been a recurring component in films, the "action film" genre began to develop in the 1970s along with the increase of stunts and special effects.
The genre is closely associated with the thriller and adventure film genres, and it may also contain elements of spy fiction and espionage.
Some historians consider The Great Train Robbery to be the first action film. During the 1920s and 1930s, action-based films were often "swashbuckling" adventure films in which actors, such as Douglas Fairbanks, wielded swords in period pieces or Westerns.
The 1940s and 1950s saw "action" in a new form through war and cowboy movies. Alfred Hitchcock ushered in the spy-adventure genre while also establishing the use of action-oriented "set pieces" like the famous crop-duster scene and the Mount Rushmore finale in North by Northwest. The film, along with a war-adventure called The Guns of Navarone, inspired producers Albert R. Broccoli and Harry Saltzman to invest in their own spy-adventure, based on the novels of Ian Fleming.