AutoCAD is a computer-aided drafting and design system implemented on a personal computer. It supports a large number of devices. Device drivers come with the system and include most of the digitizers, printer/plotters, video display boards , and plottersavailable on the market.AutoCAD supports 2-D drafting and 3-D wire-frame models.The system is designed as a single-user CAD package. The drawing elements are lines, poly-lines of any width, arcs, circles ,faces, and solids. There are many ways to define a drawing element. For example, a circle can be defined by the center and its radius, three points, and two end points of its diameter. The system always prompts the user for all options.Of course, the prompt can be turned off by advanced users, Annotation and dimensioning are also supported. Text and dimension symbols can be placed anywhere on the drawing, at any angle, and at any size. A variety of fonts and styles are also available.