A Christmas ornament is a decorative object that is used to adorn a Christmas tree. It can be made of a variety of materials, such as glass, wood, metal, or plastic, and can come in many shapes, sizes, and colors. Christmas ornaments can be simple or highly detailed, and some may even have moving parts or lights that make them sparkle and shine. Christmas ornaments are a traditional part of the holiday decor, and many families have a collection of them that they display on their tree each year.