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A mirror world is a representation of the real world in digital form. It attempts to map real-world structures in a geographically accurate way. Mirror worlds offer a software model of real human environments and their workings.^[1] It is very similar to the concept of a digital twin.^[2]

The term in relation to digital media is coined by Yale University computer scientist David Gelernter. He first speaks of a hypothetical mirror world in 1991.^[3]

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