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Extension cords are flexible, insulated electrical cables used to extend the reach of power sources to electrical devices. They typically consist of a plug on one end to connect to an outlet and one or more sockets on the other end to accommodate multiple devices. Extension cords come in a variety of lengths, gauges, and styles to suit different power needs and environments. They are commonly used in homes, offices, construction sites, and outdoor settings to provide convenient access to electricity where permanent outlets are not available.