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A Turing machine is a machine that can perform any possible computation, and emulate any real world computer, except other Turing machines.

A Universal Turing machine however, is a theoretical machine that could even emulate Turing Machines.

In actuallity they're both the same, since if you fed the tape from a Turing machine into another Turing machine, the second would in essence be emulating the first.

Its also useful to note that Turing machines aren't really "machines" per se, but actually models of the process of computation itself.

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