Very important concept in graphics communications is drawing – a graphical representation of objects and structures which is done using freehand, mechanical, or computer methods. Technical drawing is used to represent complex technical ideas with adequate precision for the product to be mass-produced and the parts to be easily interchanged.

An engineering (or technical) drawing is a graphical representation of a part, assembly, system, or structure and it can be produced using freehand, mechanical tools, or computer methods. Working drawings are the set of technical drawings used during the manufacturing phase of a product.