You know about Christmas but do you really KNOW about Christmas?
It is is celebrated on December 25 and what had its origins as a a sacred religious holiday is now a worldwide cultural and commercial phenomenon.
Christians celebrate Christmas Day as the anniversary of the birth of Jesus of Nazareth, a spiritual leader whose teachings form the basis of their religion.
Popular customs include exchanging gifts, decorating Christmas trees, attending church, sharing meals with family and friends and, of course, waiting for Santa Claus to arrive.
And from that has grown all sorts of "traditions" - some national, some more more-family based and some quite contemporary.