A Ladder Diagram is a graphical representation used in electrical engineering and automation to illustrate control circuits. It resembles a ladder, with two vertical lines representing power supply and horizontal lines symbolizing control elements like switches and relays. Each rung of the ladder shows the logical flow of electricity and control signals. These diagrams are commonly used in Programmable Logic Controllers (PLCs) for programming and troubleshooting. They provide a clear and intuitive way to visualize the operation of electrical systems, making it easier for engineers and technicians to understand and implement control processes.