An extension cord is a flexible electrical cable that allows you to connect multiple devices to a power source from a distance. It typically has a plug on one end and several outlets on the other, enabling you to power items like lamps, computers, and tools without being limited by the location of the wall socket. Extension cords come in various lengths and thicknesses, designed for different uses. Some are suitable for indoor use, while others are made for outdoor activities, such as powering electric tools in a garage or garden. Always check the cord's rating to ensure it can handle the power requirements of your devices.