What does a draftsperson do?

A draftsperson produces technical drawings such as blueprints of various objects. Most drafting today is done by means of computers, using CAD (Computer Aided Design).

According to AOLstudybuddy:

Drafting is also called mechanical drawing. It is the process of representing topography, engineering works, buildings, and pieces of machinery by means of special drawings called mechanical or engineering drawings. The techniques of drafting are an important part of all types of engineering and manufacturing and are used in architecture and geology.

The basic purpose of a mechanical drawing is to show the exact shape and all details of an object. An ordinary perspective drawing gives no information about hidden details of the object. The technique of conventional drafting is to use two or more projections to represent solid objects. This technique relies on ideas learned in geometry. These projections are different views of the object and are not complete in themselves, but when viewed as a collection they represent every aspect and detail of the object being represented.