Power cords are electrical cables that connect devices to a power source, allowing them to operate. They typically consist of insulated wires encased in a protective outer layer. The most common types of power cords include those used for household appliances, computers, and electronics. These cords usually have a plug on one end that fits into an electrical outlet and a connector on the other end that attaches to the device. Safety features, such as fuses and grounding, are often included to prevent electrical hazards. Proper handling and maintenance of power cords are essential for safe usage.