The purpose of your life is what connects to your soul. It makes you discover your passion and skills. It is something that utilizes your values and talents while driving you to make this world a better place.
Your purpose will always make you serve others more than serving yourself. Your life can only receive a meaning when you have a purpose to live for.
Without a clear purpose, an individual would only remain drifting and wandering. There would be nothing special for him/her to achieve. Without purpose, a person loses his sense of direction.