A transmission line is a specialized cable or wire system used to transport electrical energy over long distances. It connects power generation sources, such as power plants, to substations, where the electricity is distributed to homes and businesses. Transmission lines are designed to minimize energy loss and ensure efficient delivery of electricity. These lines can be overhead or underground and are typically made of materials like copper or aluminum. They operate at high voltages to reduce the current and, consequently, the heat generated during transmission. Proper design and maintenance of transmission lines are crucial for a reliable electrical grid.