A birthday is the anniversary of the birth of a person. It is a day when a person celebrates the anniversary of their birth. Birthdays are typically celebrated with friends and family and may include activities such as having a party, receiving gifts, and eating cake. Many people also choose to celebrate their birthday by doing something special or meaningful, such as going on a trip or donating to a charity. Birthdays are a time to reflect on the past year and to make plans and resolutions for the coming year.