Christmas or Christmas Day is an annual holiday celebrated on December 25 that commemorates the birth of Jesus of Nazareth. Christmas is central to the Christmas and it's holiday season, and in some places, Christianity marks the beginning of the larger season of Christmastide, which lasts twelve days.

Although traditionally a Christian holiday, Christmas is widely celebrated by many non-Christians, and some of its popular celebratory customs have pre-Christian or secular themes and origins. Popular modern customs of the holiday include gift-giving, music, an exchange of greeting cards, church celebrations, a special meal, and the display of various decorations; including Christmas trees, lights, and garlands, mistletoe, nativity scenes, and holly. In addition, Santa Claus in North America, Australia and Ireland is a popular mythological figure, associated with the bringing of gifts for children.