Birthday celebrations are special occasions that mark the anniversary of a person's birth. These events often include gatherings of family and friends, where people come together to celebrate the individual. Common activities during birthday celebrations include singing the Happy Birthday song, sharing a birthday cake, and giving gifts to the birthday person. Traditionally, birthday parties may feature decorations, games, and various forms of entertainment. Many cultures have unique customs associated with birthdays, such as the quinceañera in Latin American cultures or the sweet sixteen in the United States. Overall, birthday celebrations are a way to honor and appreciate a person's life and milestones.