What is Reality?

The question is just as intriguing as the answer. What is reality? Do we really know? The English definition is "The world or the state of things as they actually exist, as opposed to an idealistic or notional idea of them." Therefore what is it that actually exist? How many times have you or we thought something is real only to be proven that it was not what we thought it to be; ie an object, a idea, or a concept? Let us explore this greater mystery of life.