2D and 3D refer to the actual dimensions in a computer's workspace. 2D is 'flat', using the X & Y (horizontal and vertical) axis', the image has only two dimensions and if turned to the side becomes a line.
for eg a square drawn on a sheet of paper. thus the square will not have any volume, only length and breadth.
3D adds the 'Z' dimension. This third dimension allows for rotation and depth. It's essentially the difference between a painting and a sculpture. for eg- a cube. it will have length, breadth and hieght. thus it has volume.
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You know how 2-dimensional shapes are flat right? Well 3-dimensional means that it can go to and from you also.
3-dimensional
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The net of a 2 dimensional shape can be folded into a 3 dimensional shape
Volume is 3 dimensional, and Area is 2 dimensional.