Transmission lines refer to a network of overhead power lines designed for transmitting electrical energy over long distances. These lines are typically made up of conductive materials such as copper or aluminum, and they use tall structures like poles or towers to elevate them above ground level so that they can carry electricity from the source (such as a power plant) to distribution centers, substations, or other points where it will be used. The transmission lines are designed with specific voltage levels and capacities in mind, depending on the distance they need to cover and the amount of energy they must transmit. They play an important role in delivering electricity from generation sources to consumers, helping to ensure a reliable power supply for homes, businesses, and industries across the country or region.