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A birthday is the date on which a person was born. It is customary in many cultures to celebrate the anniversary of one's birthday in some way, for example by having a birthday party.

One traditional (USA) song to sing to someone at such a party is "Happy Birthday", particularly while bringing a birthday cake into the room, covered with lit candles. The person whose birthday it is will then make a wish and if they blow out the candles in one breath it's supposed to come true.

People often get (and give!) gifts on their birthday.

Astrological signs typically depend on one's birthday, or even the specific time of birth.

Notable birthdays can include:

The birthdays of historically significant people, like Jesus or Martin Luther King, Jr, are often turned into holidays.

See also: Birthday paradox, Birthday attack