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VFX is shorthand for Visual Effects or Special Visual Effects. Visual Effects are photos developed in post-production. Basically, they are a photo that shows up in a movie that might not be photographed throughout the main cinematography for whatever factor. Instances of VFX would be interesting creatures whose physiology makes it difficult to produce them by means of a "man in a monster outfit," establishes that are also huge and also costly to construct literally or stunts that are so harmful it's more secure to create them in post-production by means of numerous methods.