Xmas lights, also known as Christmas lights, are small decorative lights that are typically used to decorate homes and trees during the holiday season. They come in a variety of styles and colors, and are usually powered by electricity. Some Xmas lights use LED technology, which is more energy-efficient and longer-lasting than traditional incandescent lights. To set up Xmas lights, you'll need to carefully plan out your design and then find a suitable power source to connect them to. Once the lights are in place, you can turn them on and enjoy the festive atmosphere they create.