The tradition of placing presents under the Christmas tree comes from the Christian tradition of gift-giving during the holiday season. In the early days of Christianity, gifts were often given to the poor or those in need. As the tradition evolved, people began to give gifts to each other during the holiday season, and the Christmas tree became a symbol of the celebration. The tradition of placing gifts under the tree is a way of showing love and appreciation for others, and it's a tradition that has been passed down from generation to generation.