Is the World Real?

Is the world as we know it really a thing? Is it just a thought in someone's head? A we just a simulation? After reading the article "Are we a Living Computer Simulation", it has passed through my mind that the world and everything in it could just be a lie, someone could just turn their computer off and we would be gone. Personally, I don't believe what is called the computer simulation theory. This theory states that reality as we know ur, is just a computer simulation. I believe the reality as I always have, it's here and that's how we're living. In reality. Not just in someone's computer. You might think otherwise. Its really just how you perceive the theory. So, is the world real?