It stands for Personal Computer. This term was created when the first "small" PCs were made, compared to big mainframes.
The term PC (for Personal Computer) was originally used as early as 1972 in Xerox PARC (Palo Alto Research Center).
"Alongside "microcomputer" and "home computer", the term "personal computer" was already in use before 1981. It was used as early as 1972 to characterize Xerox PARC's Alto. However, because of the success of the IBM Personal Computer, the term came to mean more specifically a microcomputer compatible with IBM's PC products."
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