The Christmas season is celebrated in different ways around the world, varying by country and region. Elements common to many areas of the world include the lighting of Christmas trees, the hanging of wreaths, Christmas stockings, candy canes, and/or the creation of Nativity scenes depicting the birth of Jesus Christ. Christmas carols may be sung and stories told about such figures as the Baby Jesus, St Nicholas, Santa Claus, Father Christmas, Christkindl or Grandfather Frost. The sending of Christmas cards, the exchange of Christmastime greetings, observance of fasting and/or special religious observances such as a midnight Mass or Vespers on Christmas Eve, the burning of a Yule log, and the giving and receiving of presents. Along with Easter, Christmas time is one of the most important periods on the Christian calendar, and is often closely connected to other holidays at this time of year, such as Advent, the Feast of the Immaculate Conception, St. Nicholas Day, St. Stephen's Day, New Year's, and the Feast of the Epiphany.

David Michael Letterman (born April 12, 1947) is an American television host and comedian. He hosts the late night television talk show, Late Show with David Letterman, broadcast on CBS. Letterman has been a fixture on late night television since the 1982 debut of Late Night with David Letterman on NBC. Letterman recently surpassed friend and mentor Johnny Carson for having the longest late-night hosting career in the United States of America.

Letterman is also a television and film producer. His company Worldwide Pants produces his show as well as its network follow-up The Late Late Show with Craig Ferguson. Worldwide Pants has also produced several prime-time comedies, the most successful of which was Everybody Loves Raymond, currently in syndication.

In 1996, David Letterman was ranked #45 on TV Guide's 50 Greatest TV Stars of All Time.

Letterman was born in Indianapolis, Indiana. His father, Harry Joseph Letterman (April 1915 – February 1973), was a florist of British descent; his mother Dorothy Letterman (née Hofert, now Dorothy Mengering), a Presbyterian church secretary of German descent, is an occasional figure on the show, usually at holidays and birthdays.