The "date of birth" is the specific day, month, and year when a person was born. It is an important piece of information used for identification and legal purposes. This date helps determine a person's age and can be relevant for various activities, such as applying for a driver's license or enrolling in school. In many cultures, the date of birth is celebrated annually as a birthday, often marked by parties and gifts. It can also be used in astrological contexts, where the zodiac sign associated with the date is believed to influence personality traits and life events.