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A 3D shape has 3 axises (x,y and z), while a 2D shape has only 2 axises (x,y). Or simpler, in 3D dimension you can go up, down, left, right, forward, backward while in a 2D dimension you can only go left, right, forward, backward, excluding up and down.
A 2D shape is flat and only has a surface area whereas a 3D shape is an object that has surface area and volume.
It's a 2D shape.
a circle is a 2D shape while a cylinder is 3D shape
a pyramid is a 3D shape :)
Paper is a 3D object.