What exactly is Big Data? This video defines and explains Big Data as well as Hadoop and MapReduce in simple language.
Rating Newest Oldest. Best Answer: Time is an illusion in that it's not a real, *natural* feature of the universe. Time is not absolute, meaning there's no Cosmic Master Clock that ticks off the correct time for the entire universe.
n. 1  Something apparently seen, heard, or sensed, but having no physical reality. 2  An image that appears only in the mind; an illusion. 3  A model, especially a transparent one, of the human body or of any of its parts.