Computer-generated imagery (CGI) has been a consistent and important part of Hollywood films over the course of the past several decades. It can be defined as the art of using computer programs to create digital characters or settings in the frame of a movie. Computer generated effects are a sub-category of special effects, along with visual and physical effects. The most important stages of creating CGI are: pre-visualization, scanning, modeling and rendering. CGI began to be used in the 1950s and 1960s mostly in the military, but it did not appear in movies until the second half of the 1970s, the first significant CG effect being used in Futureworld (1976). After The Juggler's motion capture effect was introduced in 1981, CGI slowly began to be used in movies throughout the 1980s, but it had only a marginal role, except in Tron (1982) where it was used extensively. In the 1990s CGI was given more credit, as it was used as a support to the story of the movies. This was the golden era of CGI application, introducing incredible advancements in facial and motion capture in Terminator 2: Judgment Day (1991), first photorealistic CG dinosaurs on film in Jurassic Park (1993), first fully computer animated film with Toy Story (1995), and many others. In the 2000s, further innovations were invented in facial capture technology in the films The Lord of the Rings (2001-2003) and Avatar (2009). In the 2010s CGI became its own trap. Its extensive use is overshadowing the storyline and its primary purpose of supporting the story is getting lost. Despite of this, movies showing vast CG battle-scenes are the highest-grossing ones.