The first day of Christmas is December 25th, the day when Christians celebrate the birth of Jesus Christ. It is also a festive occasion in many countries, marked by gift-giving, feasting, and singing. The 12 days of Christmas refer to the period of celebration following the birth of Jesus Christ, from December 25th to January 6th. The song "The Twelve Days of Christmas" is a popular Christmas carol that depicts the gifts given by a lover to their beloved over the 12 days of Christmas.