Christmas, celebrated annually on December 25th, has both religious and cultural origins that go back thousands of years. Its origins as a Christian holiday lie in the belief that Jesus Christ was born on this date. The exact date of Jesus' birth is not known, but December 25th was chosen by the early Christian church in the 4th century, possibly to coincide with existing festivals celebrating the winter solstice, many being Roman festivals. By having Christmas align with these wintertime celebrations, early Christians could more easily convert pagans (people holding unrecognized religious beliefs) to Christianity while still honoring their traditional customs.

Over time, Christmas evolved beyond its religious origins into a more festive holiday, particularly in Europe. In the Middle Ages, it became a time for feasts and social gatherings. During this period, traditions such as decorating homes, singing carols, and exchanging gifts began to popularize. The modern image of Santa Claus, for example, has roots in both European folklore and the Dutch legend of Sinterklaas, who was based on Saint Nicholas, a 4th-century bishop known for his generosity. Saint Nicholas' charitable acts evolved into the Santa Claus figure we know today, with his sleigh, reindeer, and red suit, popularized in the 19th century.

The commercialization of Christmas began in the 19th and 20th centuries, with the progression of mass production and advertising. During this time, Christmas cards, Christmas trees, and the tradition of giving presents became common in the United States and Europe. The influence of literature further emphasized generosity and family togetherness as traditions on the holiday. Today, Christmas is celebrated globally, blending its Christian, cultural, and commercial aspects into a holiday that is enjoyed by people of many different backgrounds and traditions.