AutoCAD is a large-scale computer-aided drawing software developed by Autodesk company in the United States, which is mainly used to draw working drawings. It provides powerful two-dimensional and three-dimensional design and drawing functions for job designers. At present, Auto CAD has been widely used in the design fields of machinery, electronics, clothing, architecture and so on.

This is the answer that Baidu found. At present, building plans, dimensional drawings, construction drawings and circuit diagrams are widely used. There is also mold design. This mainly depends on the occupation of the user.

There are many kinds of AutoCAD certificates, some of which are certified by the state and some by the Education Bureau. Personally, I think that software like these mainly depends on experience and operation, because many things can't be learned in school, and they are all taught by people who face the work, grope for themselves or have experience.