Visual Special Effects (VFX or VSFX) generally involves an amalgamation of live footage and computer generated imagery (CGI ) for creating scenes which looks realistic, but are impossible to capture on camera, or where the shooting costs are very huge.
Nowadays, Visual Special Effects are common in high-budget films.
Aspirant filmmakers also prefer to use Visual Special Effects.
Use for excellent quality VFX can thrill the audience and help them visualize a whole new world, which would have, otherwise, been impossible to even think of.