Humans have always thought of consciousness as property possessed by a living organism, without being able to properly define it in scientific terms. Many articles have been published to explain what consciousness is. In this article, consciousness has been defined as a quantity (‘variable’ would be a better word according to mathematics), which is linked with entropy of the system. The article explains consciousness, its role in the universe, not only in living systems, but also in non-living thermo-dynamical systems. Not only that, the article also explains its role with quantum biology, a newly emerging field of biology.