A  schematic diagram is a fundamental two-dimensional circuit representation showing the functionality and connectivity between different electrical components. It is vital for a PCB designer to get familiarized with the schematic symbols that represent the components on a schematic diagram.

A schematic, or schematic diagram, represents the elements of a system with abstract and graphic symbols instead of realistic pictures.

An electronic schematic to electronics is what a recipe is to a chef. It will tell you what ingredients to use and how to get the ingredients arranged and connected. Instead of explaining the recipe with details, a schematic diagram is used to depict the construction of electronics. Electronic schematics consist of digital electronic symbols that represent each of the components used. 

The schematic diagrams are also used in many other fields, not just in electrical systems. For example, when you take the subway, the subway map for passengers is a kind of schematic, and it represents subway stations with dots. The chemical process can also be displayed in a schematic diagram with symbols of chemical equipment.