Computer-Aided Design, or CAD, is a combination of hardware and software that enables engineers, animators, and architects to design anything they would like. This programs allows creation of 2D and 3D graphical representations of physical objects. In addition to the software, CAD systems also require a high quality graphics monitor, a light pen or drawing tablet, and a special printer or plotter for printing the design specifications. CAD systems allow the user to view their design from any angle as well as zoom in and out on any specified point, allowing for better visualization of whatever the final product my be. The computer also keeps track of any dependencies, so that when one value is changed, all other values that depend on it are also automatically changed. This creates greater accuracy and therefore reduction of error. CAD software is also less expensive in the long run, and allows high productivity and higher product quality because of how easy it is to edit and re-use designs.
There are several different types of CAD software. Fiberism is a program that allows for design of innovative, durable, and lightweight products made from advanced composite materials. Seat Design Environment is a program that utilizes 3D CAD systems for designing and manufacturing innovative transportation seat systems and interior components. Solid Edge is a combination of 2D and 3D systems that allows for accelerated design, change, and re-use of designs. Lastly, Parasolid is a 3D geometric modeling component software that is used as the geometry engine in many different CAD applications. There are many more different types of CAD software, but these are just a few.
References:
http://www.webopedia.com/TERM/C/CAD.html
http://www.plm.automation.siemens.com/en_us/plm/cad.shtml
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