
Action movie is a genre in which the protagonist is put into a series of events that usually have violence, physical actions, explosions, and bloody fight scenes. The genre is usually about a resourceful hero fighting against overwhelming odds, with life-threatening situations, villains, and an unending chase which usually ends in victory for the hero.
Action movies became cheaper and easier to make as computer-generated imagery (CGI) evolved. Action sequences and other visual effects that needed stunt crews were more expensive in the past. Reactions to action movies with a large amount of CGI have been mixed. Some movies use CGI to create events that are not realistic and are unbelievable. Action has been a part of movies for a long time but the "action movie" genre did not start until the 1970s along with the increased use of stunts and special effects.