Blueprint (/ˈbluː.prɪnt/) is the act and discipline of composing drawings that visually communicate how something functions or is constructed. The technical drawing is essential for communicating ideas in industry and engineering. To make the drawings easier to understand, people use familiar symbols, perspectives, units of measurement, notation systems, visual styles, and page layouts.
The need for precise communication in the preparation of a functional document distinguishes technical drawing from expressive drawing of the visual arts. Artistic drawings are subjectively interpreted; their meanings are multiply determined. Technical drawings are understood to have one intended meaning.