Bazi (八字) literally translates as 8 characters. Each pair of hieroglyphs is the year, month, day and hour of birth. This is a reflection of the energy that the child breathed in at the first breath. This energy is a kind of program for the rest of your life. A person may complete this program and reach the peak of his abilities, or he may not complete it, missing good moments or trying to achieve something that is not given to him.
Credit Wikipedia