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### Theory:

Picture 1

A plain sheet of paper

Picture 2

A box
• As soon as we see the above picture, we know the difference between the two. Picture $$1$$ is two dimensional($$2D$$); picture $$2$$ is three dimensional($$3D$$).
• The two-dimensional($$2D$$) images have only two dimensions they are length and height. But, a three-dimensional image($$3D$$) has length, height and width.
• Three-dimensional videos will bring the scenes alive before our eyes. Many three dimensional films have already been produced. Recently, three-dimensional games have also developed.
• Now there is another new technology-virtual reality in $$3D$$. Virtual reality is a technology that shows the computer image as a real image.
• When we see games through this technology, we can perceive the game's setting as a real thing. Now, this technology has been introduced in smart phones also.