The 12 Days of Christmas is a classic Christmas carol that dates back to the 18th century. The song lists a series of gifts given on each of the 12 days leading up to Christmas. The gifts are usually listed in order of increasing extravagance, with the most expensive gift coming last. The 12 days of Christmas are often associated with the period between Christmas and the Epiphany, which is the 12 days leading up to January 6th.