Filters.Said or written to a person who is celebrating his or her birthday in order toconvey the good wishes of the speaker or writer (literally, "may you have a happy birthday") When Stuart entered the room, everybody yelled, "Happy birthday!" interjection.
A person's birthday is a special day. This is the date when the person was born. people around the world cleberate birthdays in different ways. In many countries people clebrate with a cake. There are candles on the cake. There is one candle for each year of the person's life. People sing a song for the person. At the end of the song, the person's blows out the candles.