In electronic design automation, before the 1980s schematics were the only formal representation for circuits. More recently, with the advancement of computer technology, other specimens have been introduced and technical computer languages have been developed, as with the explosive increase of the complexity of electronic circuits, traditional schematics have become less practical. For instance, hardware description languages are indispensable for modern digital circuit design.
In electronic and electrical industry, a schematic diagram is often utilized to describe the design of equipment. Schematic diagrams are often employed for the maintenance and repair of electronic and electromechanical systems.  Original schematics have been done by hand, with standardized templates or pre-printed adhesive symbols, however now electronic design automation software (EDA or"electric CAD") can be used.
Schematic diagrams are used extensively in repair manuals to help users understand the interconnections of components, and also to supply graphical instruction to help out with rebuilding and simplifying mechanical assemblies. Many motorcycle and automotive repair manuals devote a substantial number of webpages on schematic diagrams.
A design, or schematic diagram, is a representation of these elements of a system using abstract, graphic symbols rather than realistic pictures. A schematic generally communicates all details that are not pertinent to the information that the cheque is intended to communicate, and may add unrealistic components that aid comprehension. As an example, a subway map meant for passengers can represent a subway station with a scatter; the scatter does not resemble the true station whatsoever but provides the viewer information without any unnecessary visual clutter. A schematic diagram of the chemical procedure uses symbols to represent the vessels, piping, valves, pumps, and other equipment of the system, emphasizing their interconnection controlling and paths physiological information. In a digital circuit diagram, the design of the symbols might not resemble the layout from the circuit. From the schematic diagram, the symbolic components are organized to be easily interpreted by the viewer.
In electric power systems layout, a schematic drawing referred to as a one-line diagram is often used to symbolize substations, distribution methods as well as whole electric power grids. All these diagrams compress and simplify the details which would be replicated on each individual phase of a three-phase system, demonstrating just one element rather than three. Electrical diagrams such as switchgear often have common device functions designate by standard function numbers.
A semi-schematic diagram unites some of the abstraction of a purely schematic diagram with different elements displayed as realistically as possible, for a variety of factors. It is a compromise involving a purely subjective diagram (e.g. the schematic of the Washington Metro) and an exclusively pragmatic representation (e.g. the corresponding aerial perspective of Washington).
These tools go beyond straightforward drawing of connections and devices. Normally they're incorporated into the whole IC design flow and linked to additional EDA tools for verification and simulation of this circuit under design.