A schematic diagram is a simplified representation of a system or process, often used in fields like engineering and electronics. It uses symbols and lines to illustrate how components are connected and interact with each other, making it easier to understand complex systems. For example, in a circuit diagram, various electronic components like resistors and capacitors are represented by standardized symbols. These diagrams are valuable tools for troubleshooting and designing systems, as they provide a clear overview without the clutter of detailed drawings. By focusing on the relationships between parts, schematic diagrams help engineers and technicians quickly identify issues and plan modifications.