Ah, yes, outdoor Christmas lights. They're a wonderful way to add some festive cheer to the outside of your home. To plug them in, you'll need to find an outdoor outlet, which is typically located near the front or back door of the house. You'll also need an extension cord with a GFCI (Ground Fault Circuit Interrupter) to ensure that the lights are safe to use in wet weather conditions. Once you have the outlet and the extension cord, you can plug the lights in and enjoy the beautiful display.