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A POTD is an acronym for "Photo of the Day", "Picture of the Day", "Post of the Day" or "Poll of the Day". It is a term most commonly used by online digital photography communities as an honor to outstanding photos that are selected daily from among that community's membership. They can either be tagged as POTD or displayed in a special page on that site...

Christmas or Christmas Day is a holiday generally observed on December 25 (with alternative days of January 6, 7 and 19) to commemorate the birth of Jesus, the central figure of Christianity. The exact birthday of Jesus is not known, and historians place his year of birth some time between 7 BC and 2 BC. The supposed details of his birth are recorded in two of the Canonical gospels in the New Testament of the Bible...