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 that goes into a wall outlet and one or more sockets on the other end for connecting appliances or tools. Extension cords come in various lengths and can be used indoors or outdoors, depending on their design and rating. These cords are useful for powering devices that are far from an outlet, such as power tools, lawn equipment, or holiday lights. However, it's important to use them safely by avoiding overloading and ensuring they are rated for the intended use to prevent electrical hazards.