In film industry, technically special effects are nothing but the real things like a stunt car pile-up on set, or a carefully rigged fire, or even red-colour capsules put under someone's shirt to give blood effect. They are generally effects done on set itself, but not digital. We can call them as practical effects too. Before the advent of digital technology, everything was special effects.
Special Effects (SFX)
Effects exactly what it sounds like, anything you physically add in a scene to achieve the goal that will appear as if, it is natural. There are various techniques present under this such as Bullet time, Dolly zoom, Match moving, Matte painting, Morphing, Stop motion etc. Practical effects are as old as cinema. With every passing decade, the stunts happened to be more dangerous and unrealistic.
Here are 6 Hollywood movies that still look good without much digital intervention:
Jurassic Park (1993)
2001: A Space Odyssey (1968)
Terminator 2: Judgement Day (1991)
Close Encounters of the Third Kind (1977)
Back to the Future II (1989)
Star Wars (1977)
Visual Effects (VFX)
With the release of Star Wars in 1977, the world experienced breath-taking Visual effects that were completely unique at that time. Using computers to add effects known as visual effects or VFX done by visual effects makers became the rising sun of that era.
In the entertainment world there was an explosion of visual effects and advancements in camera tracking, composting, and computer animation. Computer generated imagery (CGI) used by film-makers, is the usage of computer graphics for special effects in movies. Jungle Book, which is almost entirely computer generated.
Here are 5 Hit Hollywood movies
1. Star Wars: Episode V - The Empire Strikes Back
2. The Matrix
4. Jurassic Park
Surprisingly, Filmmakers and ad film makers are most widely using visual effects techniques ranging from films, ads to print media.