Christmas is celebrated on December 25th because it is believed to be the day that Jesus Christ was born. According to the Bible, Jesus was born in a stable in Bethlehem, and the star of Bethlehem was a sign that he was the messiah. The celebration of Christmas is a reminder of the gift of Jesus and his teachings of love, peace, and kindness. It is also a time for families to come together and celebrate the holiday with traditions and festivities.