Computer-aided design (CAD) is the use of computer system to create two- or three-dimensional (2D or 3D) graphical impression of physical objects. Computer aided design is used for creation, modification or optimization of an engineering design. CAD output is usually in the form of electronic files for print, manufacturing or other manufacturing processes. The technical and engineering drawings and pictures must convey information like materials, processes, dimensions and tolerances consistent with application-specific conventions. CAD could also be wont to design curves and figures in two-dimensional (2D) space or curves, surfaces and solids in three-dimensional (3D) space. CAD is additionally wont to produce computer animation for the computer graphics utilized in , for instance , advertising and technical manuals. CAD is a crucial industrial art and is that the way projects come true. it's extensively utilized in many applications, including automotive, ship building and aerospace industries, and in industrial design. The CAD development and outputs are essential to successful solutions for engineering and manufacturing problems. CAD software helps us explore ideas, visualize concepts through photo realistic renderings and films and simulates how the planning project will perform within the world .