The first movie to use computer generated imagery was Westworld. Released in 1973, the film used early CGI to show the robotic vision of a character. This was the first time computer generated imagery in film was applied in a practical way, using computers to digitally process images instead of relying only on traditional camera effects. Even though the visuals were simple, this experiment clearly explained what is cgi in movies and how digital technology could support storytelling. This small but important use of computer generated imagery opened new possibilities for filmmakers. It later inspired more advanced CGI work in films, leading to visually rich scenes and eventually full cgi film productions that are common in modern cinema. Conclusion: Westworld marked the beginning of computer generated imagery in film. Its early CGI use laid the foundation for today’s advanced cgi film industry and helped define what is cgi in movies as an essential part of filmmaking.