Christmas lights (also known as fairy lights) are festive decorations used for the holiday season. They are often used on trees, houses, and outdoor areas. The lights usually come in the colors of red, green, and white. They are traditionally used to light up the dark winter nights and bring a festive atmosphere to the home. Christmas lights first became popular in the United States during the late nineteenth century. At this time, people used candles to decorate their houses and Christmas trees. Then, in 1882, Edison's Pearl lights were introduced and quickly became popular in the United States and Europe. These lights were small globes illuminated by a light bulb and placed in glass tubes. Today, Christmas lights come in many colors and styles. There are traditional lights, with colored bulbs, and there are also modern lights which can be programmed to flash in different patterns. Some houses are even decorated with light sculptures and other festive displays. These days, Christmas lights are used to decorate not only homes but also businesses and public areas. In some places, they are also an important part of celebrating Christmas. No matter the style or design of the lights, they bring a joyful atmosphere to the holiday season and help people celebrate the season with warmth and cheer.