This identifies individual objects on the screen, like a box within a box. Molds and re-shapes objects. CADD comes in many forms. CADD uses lines in a 3 Dimensional form. This is useful in drawing complex buildings and spheres.
CADD output comes in many forms also.
Images may be produced by printer, which is less accurate, and by plotter, which draws all lines and curves by a small pen. This is the most accurate form of CADD reproduction and output. CADD is widely used in industry. It is slowly replacing all hand methods, since it is fast and simple. A drawing that might take 10 days to make could now take 10 minutes on computer.