A pigtail light, otherwise known as a pigtail socket, is a temporary light socket. One end features a screw-in light bulb receptacle, and the other has two wires. Connecting the wires to a live electrical connection illuminates the bulb.
Some pigtail lights feature a colored diode instead of a light bulb socket. This type of pigtail light, called an LED pigtail, is popular in automotive and marine applications because it has a slim profile and fits in spaces too small for a standard light bulb. LED pigtails come in several colors. Standard models emit a steady beam, and blinking models emit flashes of light.