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The full form of CAD is Computer-aided design, which means creating, modifying, analyzing and optimizing any design using a computer. CAD Softwares are used by designers to enhance productivity and make precision designs. CAD Softwares are used by across industries like Manufacturing, Automobile, Aviation, electrical, civil, architectural, etc. CAD design engineer used CAD Software to make 2D and 3D design to create models prototypes 3d printing and also used for Analysis.

CAD is used:

1. To Produce 2D or 3D Engineering drawings in Mechanical, civil, architectural or electrical industry.
2. In Mechanical Industry, CAD is used to Creating concept design, Product Layout, strength and dynamic analysis of assembly.
3. In civil and Architectural industry, CAD is used to create the 2D layout, plan, 3D elevations, Building Information Modelling (BIM), estimation, costing and rendering.

CAD Softwares are broadly 2 types.

1. 2D CAD tools. These were developed in the early 1970s and rely on basic geometric shapes such as circles, rectangles, lines, etc. to create flat drawings.
2. 3D CAD tools. More advanced software that was developed in the 1980s. It has improved graphics display capabilities that enable you to create realistic 3D images. You need professional training to master this software. 

 3D CAD software can be further categorized into:

1. Wire-frame models. These have become old-fashioned and they create skeleton-like models with arcs and lines.
2. Surface models. These create models by joining 3D surfaces. The background is not visible which makes the surface models quite realistic.
3. Solid models. The most useful CAD models. They are a step up from surface models as they have added properties such as density, volume, and weight that make them resemble real physical objects. Solid models are utilized as prototypes to work on engineering designs.

AutoCAD is a software application used for Computer-Aided Design and Drafting. AutoCAD is Developed by Autodesk, A Commercial CAD animation Software company, headquartered in San Rafael, California, United States. The first AutoCAD version was released in 1982  by John Walker. AutoCAD software is used for 2D and 3D design and drafting in across industries like Civil, Architectural, Manufacturing, aviation, Automobiles electrical and electronics.

AutoCAD software is used to increase the productivity of the designer, improve the quality of design, improve communications through documentation, and to create a database for manufacturing or civil. CAD output is often in the form of electronic files for print, machining, or other manufacturing operations. The term CADD (for Computer-Aided Design and Drafting) is also used.