What is Real?

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I mean really how do we know anything is real? When you wake up in the morning how do you know you are not still dreaming? What proof do you have that all this isn't fake. Maybe we are all the images in the dreams of some other being and none of us are really alive. Maybe this is like the Matrix and we are all jacked in to a simulated reality. If someone created a simulation real enough how would you tell the difference between the real world and the fake one? What is real, how do we define it, and if that is real then what isn't real?