Birthday Celebrations | the anniversary of a birth. the day of a person's birth. a day marking or commemorating the origin, founding, or beginning of something. the festivities or celebration marking such a day or anniversary.
Celebrating a person's birthday is important because it shows the person you're thinking of them and in turn, they feel valued by you. Wishing someone a happy birthday is an easy way to create a positive experience between you and others. It also helps you build your reputation.