considered a sub-category of special effects; refers to anything added to the final picture that was not in the original shot; visual effects can be accomplished in-camera (like stop motion, double exposures and rear/front projection) or via a number of different optical or digital post-production processes ( CGI, for example), usually with a computer
change in the elements, characteristics, character and qualities of a view as a result of development. These effects can be positive or negative.
Special effects. A wide range of electronic video transitions and methods of combining video sources. Included are wipes, keys, mattes and inserts.
Anything added to the final picture that was not in the original shot. Commonly done now days with computers. In the beginning VFX were done entirely inside the camera, or added to the film negative.
Alterations to a film's images during post-production. Contrast with special effects (except in UK television, where visual effects and special effects are sometimes the same).
Visual Effects (or 'VFX' for short) is the term given to a sub-category of special effects in which images or film frames are created or manipulated for film and video. Visual effects usually involve the integration of live-action footage with computer generated imagery or other elements (such as pyrotechnics or model work) in order to create environments or scenarios which look realistic, but would be dangerous, costly, or simply impossible to capture on film. They have become increasingly common in big-budget films, and have also recently become accessible to the amateur filmmaker with the introduction of affordable animation and compositing software.