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.
Definition of illusion for English Language Learners. : 1  something that looks or seems different from what it is : something that is false or not real but that seems to be true or real. : 2  an incorrect idea : an idea that is based on something that is not true.