Explain with examples, what are reversible and irreversible processes? Why can a reversible process be attained only in a hypothetical situation?

A thermodynamic process (state i → state f ) is said to be reversible if the process can be turned back such that both the system and the surroundings return to their original states, with no other change anywhere else in the universe. As we know, in reality, no such processes as reversible processes can exist. Thus, the reversible processes can easily be ___ ___ ____ _________ ______ ________ ____ ___.
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