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Computer aided design (CAD) tools and systems are used for a wide variety of purposes. Designers, engineers, draftsmen, architects, artists and many other professionals all use CAD tools and systems to design things and draw things on a computer. When people need to buy CAD software or CAD systems, they go to retailers that sell CAD systems, CAD hardware and CAD software. Some firms specialize in CAD and computer-aided design work. When people need professional help with CAD systems and software, they turn to CAD services and CAD specialists. Some CAD systems allow people to draw and design 2-dimensional images on a computer while others allow users to design in three dimensions. Some CAD programs are used specifically by a certain type of professional, such as an aerospace design CAD program while others can be used for a variety of purposes.
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