As the word itself suggests, a worldview is an overall view of the world. It isn’t a physical view of the world (like the sight of planet Earth you might get from an orbiting space station) but rather a philosophical view of the world—and not just of our planet, but of all of reality. A worldview is an all-encompassing perspective on everything that exists and matters to us. A worldview represents a person’s most fundamental beliefs and assumptions about the universe they inhabit. It reflects how they would answer all the “big questions” of human existence, the fundamental questions we ask about life, the universe, and everything.
Worldviews matter, in the first place, because everyone has one, although not everyone is aware that they have one. A worldview is as indispensable for thinking as an atmosphere is for breathing. You can’t think in an intellectual vacuum any more than you can breathe without a physical atmosphere. Most of the time, you take the atmosphere around you for granted; you look through it rather than at it, even though you know it’s always there. The same goes for your worldview: normally you look through it rather than directly at it. It’s essential, but it usually sits in the background of your thought.