That's a great question! The top of a Christmas tree is usually adorned with a special ornament or decoration to symbolize the star or angel that guided the wise men to the manger. Common ornaments include stars, angels, bells, and other symbols of Christmas. Some people also use a tree topper, which is a decorative item placed on top of the tree to complete the look. The topper can be anything from a star or angel to a simple ribbon or bow. What's your favorite tree topper?