A birth chart (also known as a natal chart) is a visual way of charting the arrangements of the elements of our solar system as they were at a particular point in time - usually the time of a person's birth. The chart will show the exact positions of the Sun, Moon, and planets at the moment, relative to the place of birth (or any other event being charted), and is unique to that particular location and time.
You can gain valuable information from a birthchart about all manner of things in your life, your relationships and your future. It outlines your natural skills and inclinations, and reveals your strengths and weaknesses. No two birth charts are exactly the same, not even for twins.
Your own personal birth chart is all about you - a map of your personality, and is as part of your unique identity as your fingerprints or your signature. It can be an effective method to personal insight and your relationships, and contemplating the meaning of your chart can help you learn more about yourself and how you relate to others.