Consciousness has been taken as a phenomena of alertness or awareness to the outer world, sensory information input as well as inner self. It is exhibited in different forms of behavior. It has been presumed by the philosophers as well as neuroscientist that the processes of consciousness are being operated by brain and it has a definite neural activity involvement. But what are the exact neural correlates of consciousness and how body physiology is linked with the phenomena of consciousness is still not clear. In the present article the views of several Philosophers, Neuroscientists and Physiologist have been quoted and reviewed in trying to understand basic nature and physiological significance of consciousness.