Just as the sun is the center of the orbit of all the planets in the solar system, it's also the center of you -- your inner fire, the vital energy that will run through you your whole life. It represents your basic, core personality, separate from all the other influences that drive you.
Your Sun tells a lot about you, not only your personality itself but your strengths and challenges in life and your purpose here on Earth. That's a lot of meaning and information for one planet to carry! That's why it burns so brightly, with such strength.
You've probably heard the old cliché, 'Hey, baby, what's your sign?' That refers to your Sun Sign -- where the Sun was in the Zodiac at the moment you were born. Even if you think you're not that similar to a description of your Sun Sign, don't be fooled. Some people have complex charts with lots of strong and varied influences that give them multifaceted, even seemingly contradictory personalities.
But in general, through the course of your life, you'll move closer to the true meaning and energy of your Sun Sign, because that is the core of you. It embodies who you are, who you're striving to be, the lessons you need to learn and the strengths you already possess to get where you're going in life.
The Sun rules the warmhearted sign of Leo; read about Leo to learn more about this sign and the Sun's influence on it.