Christmas is one of the most widely celebrated holidays in the United States, with many families observing a variety of traditions to mark the occasion. The most popular traditions include decorating a Christmas tree with ornaments and lights, exchanging gifts, singing carols, attending church services, and enjoying a festive feast with family and friends. Many families also attend a Christmas Eve service and leave cookies and milk out for Santa Claus. On Christmas Day, families often open presents and enjoy a special meal together. In some regions, children also leave a cookie or a small snack out for Santa Claus and his reindeer.