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.