CGI, or Computer-Generated Imagery, refers to the creation of still or animated visual content using computer software. It is widely used in various fields, including film, video games, and advertising, to produce realistic images and effects that would be difficult or impossible to achieve with traditional methods. In movies, CGI allows filmmakers to create stunning visual effects, such as fantastical creatures or expansive landscapes. Popular films like Avatar and Jurassic Park showcase the power of CGI in bringing imaginative worlds to life, enhancing storytelling and audience engagement.