There is also an unending quest to explain foobar. Hard to explain something that's not defined. We can still talk about what meaning we put into this term. My favorite analogy is the flow of electrons in a processor chip is its consciousness and the algorithm it's performing is its cognition. Using this analogy, consciousness is the process that updates our world, i.e. the process that makes a photon move forward, while cognition is the logical interpretation of these updates.