Send Christmas Scraps, christmas images, merry christmas comments to your friends and family. Christmas is a celebration of the birth of Jesus. It is celebrated on December 25. Many days before the christmas coloured lights decorate many town centres and shops, along with shiny decorations, and artificial snow painted on shop windows. In streets and shops, 'Christmas trees' (real or plastic evergreen 'conifer' trees) will also be decorated with lights and Christmas ornaments.