VISUALEFFECTS
Visual effects
Visual effects are the various processes by which imagery is created and/or manipulated outside the context of a live action shot. Visual effects involve the integration of live-action footage and generated imagery to create environments which look realistic, but would be dangerous, expensive, impractical, or simply impossible to capture on film. Visual effects using computer generated imagery has recently become accessible to the independent filmmaker with the introduction of affordable and user friendly animation and compositing software.The above text is a snippet from Wikipedia: Visual effects
and as such is available under the Creative Commons Attribution/Share-Alike License.