Consciousness is feeling of living or existence. It is what it feels like to be YOU…YOURSELF. I’m writing this - I’m conscious of what I’m writing. It’s basically you and your thoughts. The concept sounds easy until some philosophers asked Where does it comes from? and for that matter why are we aware at all? That’s a great question imo. Years passed we still don’t know where does consciousness comes from and from where does it originates.
I think consciousness is something that cannot be explained within the laws of physics. It’s something we don’t know completely, brain is such a complex thing, we are still unable to understand it fully. Consciousness is something which is connected to the universe, with the god, with nothingness.
Update:
Consciousness definition from a pessimistic nihilism.
“I think human consciousness is a tragic misstep in human evolution. We became too self aware; nature created an aspect of nature separate from itself. We are creatures that should not exist by natural law. We are things that labor under the illusion of having a self, a secretion of sensory experience and feeling, programmed with total assurance that we are each somebody, when in fact everybody’s nobody. I think the honorable thing for our species to do is deny our programming, stop reproducing, walk hand in hand into extinction, one last midnight, brothers and sisters opting out of a raw deal.” - Rustin Cohle