A birthday is an occasion when a person or institution celebrates the anniversary of their birth. Birthdays are celebrated in numerous cultures, often with a gift, party, or rite of passage. Many religions celebrate the birth of their founders with special holidays (e.g. Christmas, Buddha’s Birthday). Note the distinction between birthday and birthdate: The former occurs each year (e.g. December 18), while the latter is the exact date a person was born (e.g., December 18, 1998).

This article uses material from the Wikipedia article Birthday, which is released under the Creative Commons Attribution-Share-Alike License 3.0.