Christmas lights, also known as fairy lights, are strings of lights often used for decoration during the Christmas season, especially on Christmas trees. Outdoor Christmas lights in vacation spots and shopping malls are often connected to electric power grids. Indoor lights are often battery-powered or electrically connected to the house power grid. Christmas lights come in many shapes and sizes, from the traditional mini-lights to larger C7 and C9 lights, and even larger, wildly shaped large light displays known as 'megatrees.' Most sets of Christmas lights feature a variety of hues, including white, red, blue, and green. Some sets even feature the traditional colors of Christmas, such as gold, silver, and the rarer pink. Christmas lights can be used to decorate trees, windows, doors, stairs, and other objects indoors and outdoors. Outdoor lights, such as those found on trees or street lights, are often common features of the holiday season. Christmas light displays are popular with many people who enjoy spending time setting up the decorations and seeing the results of their hard work. Every year, hundreds of thousands of people visit holiday light displays, many of which are quite elaborate. Christmas lights have become a staple of the Christmas season, and can be found in many homes all over the world. Whether they are hung indoors, outdoors, or in any other creative way, they have come to represent the spirit of Christmas and the joy of the holidays.