When you blow out the candle on your birthday cake, you are following a tradition that dates back to ancient Greece. The Greeks believed that the smoke from the candle carried their prayers and wishes to the gods. Today, many people still make a wish before blowing out the candle, hoping that it will come true. Some people also believe that you should not tell anyone your wish, or it will not happen. Whether you believe in these superstitions or not, blowing out the candle is a fun and festive way to celebrate your special day.