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Definition: CAD (Computer Aided Design)
CAD or computer aided design refers to the technique of using computers for the creation or modification of designs. These designs generally refer to technical drawings of machines & their parts or buildings etc. They may also refer to the architectural design of a building.
This technique is primarily used to enhance the productivity of the designer or to improve the quality of designs. As is the case with manual drawings, CAD drawings also convey some important information such as the dimensions, material, tolerances etc.
There are a variety of CAD software available. Some allow drawings only in two dimensions whereas few of them also allow drawings in three dimensions. Some of the most commonly used software packages used for CAD are Autocad, Solid Works etc.