The tradition of decorating a tree at Christmas is believed to have originated in the 18th century in Germany. The trees were decorated with apples and nuts, symbolizing the bounty of the harvest. As the tradition spread, the trees were decorated with candles, sweets, and other items that held significance to the holiday. Over time, the trees became more elaborate and a popular symbol of the Christmas season, with various decorations representing different aspects of the holiday. The custom of decorating a tree at Christmas has been celebrated by many cultures around the world, becoming a beloved tradition that brings joy and magic to the season.