Could someone please explain the equation e=mc2 in layman terms please?

I've searched the web and have so far found nothing in the way of what you might call a step by step "simple explanation" (if there indeed is one). I was wondering if anyone could explain this equation to me in layman's terms without writing a thesis. If possible could you add any practical... show more I've searched the web and have so far found nothing in the way of what you might call a step by step "simple explanation" (if there indeed is one). I was wondering if anyone could explain this equation to me in layman's terms without writing a thesis. If possible could you add any practical applications to which this equation applies to? Thanks.
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