3-dimensional images or commonly abbreviated as 3D is a picture or painting that seems to have 3 dimensions of length, height, and width. In general, if we draw on paper, the result is called a 2-dimensional painting because it only has a length and width only.
But through this 3-dimensional artwork, one can create a different perspective that can fool the eye, thus making the image appear to arise. To make it takes a special skill, because it can not just scribble on paper, but everything must be taken into account in order to look more real.