Computer-generated imagery (CGI) is a specific technology or application of computer graphics for creating or improving images in art, printed media, simulators, videos, and video games. These images are either static (i.e. still images) or dynamic (i.e. moving images). CGI refers to 2D computer graphics and (more frequently) 3D computer graphics with the purpose of designing characters, virtual worlds, or scenes and special effects (in films, television programs, commercials, etc.). The application of CGI for creating/improving animations is called computer animation, or CGI animation.