Natalis, commonly known as a birthday, is the annual celebration of the day a person was born. This occasion is often marked by gatherings with family and friends, where people celebrate with food, cake, and gifts. The significance of a birthday varies across cultures, but it generally symbolizes the passage of time and personal growth. In many cultures, specific traditions are associated with birthdays. For example, in the United States, it is customary to sing "Happy Birthday" and blow out candles on a cake. In some cultures, reaching certain ages, like the Sweet 16 or Quinceañera, holds special importance and is celebrated with larger festivities.