Computer Generated Imagery (CGI) as a more general term encompasses both static and dynamic images. Computer animation, on the other hand, refers only to moving images. Modern computer animation often uses 3D computer graphics, although 2D computer graphics are still used in stylistic, low bandwidth (small difference between end and start frequency values) and faster real-time applications. Sometimes the target of animation is the computer itself, other movies the movie. Computer-generated animations are easier to control than other physically-based processes because everything that happens on the screen is dominated by the operating system and software used. Miniatures can be created for effects shots or include extra phenomena for crowded scenes. Because it allows the creation of images that would not be possible in reality using any technology. It can also allow a single graphic artist to produce this type of content without the need for actors, expensive set pieces or props. To create the illusion of motion, an image is displayed on a computer monitor and is repeatedly replaced with a new image similar to this one, but slightly advanced over time (usually at a rate of 24 or 30 frames per second). This technique is the same technique that the illusion of motion is used in television and motion pictures. Computer animation is open to the imagination and the limits of that power. What determines this is the hardware used and the software running on it. You can click on the link for detailed information.
Source:
https://tr.wikipedia.org/wiki/Bilgisayar_animasyonu
