SPECIAL EFFECTS VS VISUAL EFFECTS. There are several terms that should be known, because some terms are often confused, namely the Special Effects and Visual Effects.
Even the Academy Awards also rename the award in one category of Best Achievement in Special Effects, a Best Achievement in Special Visual Effects, finally now a Best Achievement in Visual Effects to accommodate changing times.
Visual Effects is the term sub-category of Special Effects, where images and movies manipulated in post production. Usually visual effects scenes dealing with the integration between real human beings (live-action shot) with a CGI or other elements such as miniature, etc.
Thus, a computer-generated effects that go on in the editing process known as CGI (Computer Generated Imagery) Effects or Visual Effects - Special Effects instead.
While the Special Effects is the term used to refer to the effects used at the time of filming done.