The philosophy of dualism cropped out of the human need to understand reality. It asserts that reality or existence, as we know it, is not unified and whole but is two-sided. In essence, it is a very ambitious attempt to split apart the complex thread of existence into two distinct parts.
What are these two parts? That greatly depends on the flavor of dualism we're talking about. Some say it's the body and the soul, others say it's the mind and the body, and still others argue reality is divided into the physical and the ethereal. Regardless of the specific differentiation, dualists always spot a bifurcation in what seems to be a seamless whole.
This idea may seem abstract, but think about it. Haven't you ever felt conflicted, like you were being yanked in two different directions? That's a microcosm of the dual nature of life. Dualism says that it's not just you; the entire universe is underlining with this polarity.
Descartes, considered the father of modern Western philosophy, made dualism famous with his mind-body dualism. He proposed a distinction between matter that occupies space (res extensa) and the mind, a non-material entity (res cogitans). One is beholden to the laws of physics, the other is not.
Dualism offers a unique way of understanding reality by bifurcating it, but it isn't without its criticisms. Many have attempted to bridge the gap between these two halves. Because if the world is indeed divided in two, how could these two parts interact?
Whether or not you believe in dualism, its ideas have had profound impacts on the world, from religious, spiritual beliefs to psychological and scientific inquiries. And as a philosophical concept, it will continue to provoke us into pondering the inherent nature of our existence.