How Special Effects are created in Movies?

I always used to wonder how the special effects are created in movies. They look so mesmerizing and stunning, that you watch the movies with bated breath. In the realm of movies, special effects are swiftly becoming the industry's source of income. Numerous movies like Star Wars, Willow, and The Fantastic Four have all utilized some magnificent special effects which all were created from a computer screen. People can spring light out of their eyes or hands, trains can get overturned, and buildings can blast at one go. 

One of the most inspiring forms of electronic special effects is Chroma Green Screen, also identified as green screen. Blue screens were employed in the past, but green screens have become more of the typical form as it's easier to illuminate and use the Chroma-key and the Autocue. 

In a green screen technology, a performer enacts in front of a huge green background. Next the picture is placed into a computer, and the green background is digitally swapped. Some movies have focused on this to style some exhilarating effects. 

Films like 300, Sin City, The Spirit, and the TV show Sanctuary were filmed totally in front of a green screen and the whole scene in the movies were computer generated. You can place people in space, ancient Egypt, under water, or any other wild setting you can think of with the help of this new technology.