A schematic is a picture that uses symbols to show something simply. A schematic diagram is a drawing that depicts the components of a process, device, or other object using abstract, frequently standardized symbols and lines. A schematic diagram's main purpose is to highlight circuit elements and how their functions relate to one another. Schematics is a useful troubleshooting tool because they show which components are in series or parallel and how they are connected. A schematic design is a rough construction drawing that provides a general overview of a project's basic features and construction cost estimates, allowing you to determine whether or not your concept fits within the project budget.