A worldview is basically the lens through which you interpret the world around you. It colors everything you perceive, just as colored lenses on a pair of glasses would give a certain tint to everything you see.
A theistic worldview interprets the world with an understanding that God created and is involved in the world. An atheistic worldview is the opposite—no God, no Creator. Atheism sees the world as a collection of random events and ultimately without any purpose or meaning.
Everyone has a worldview whether they realize it or not. The Christian worldview is based on the truths of God. The Bible presents these truths. It gives clear, accurate, and time-proven truths for the world around us and tells of the God who created it. On what is your worldview based?