+A thermodynamic system is a precisely defined region of the [Universe](/wiki/Universe) under observation, delineated by real or imaginary boundaries. Across these boundaries, [Energy](/wiki/Energy) and [Matter](/wiki/Matter) may be exchanged with its surroundings, influencing the system's internal state.
+## See also
+- [Thermodynamics](/wiki/Thermodynamics)
+- [Boundary](/wiki/Boundary)
+- [State](/wiki/State)
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