CAD, or computer-aided design, refers to any software used by architects, engineers, or construction managers to create precision drawings or illustrations of new buildings as either two-dimensional drawings or three-dimensional models.
it is the abbreviation for Computer-Aided Design. It is a computer program that gives the architect opportunity to electronically plan and place elements of a building. The program adds exact details and dimensions, so the architect can see how the design will look from any angle.
Lots of Artist like Landscape Artist,Portrait Artist, and Art Students are given stuff to draw from just seeing what it looks like so that is my best guess
