A PC (Personal Computer) is just a kind of computer that suits on or under a table, often sleeping horizontally, when compared with a structure that sets vertically. Unlike a notebook, a PC is just a fixed computer that stays in a table. Now a day they are replacing with laptops due to old technology.
It is commonly using in all places of working and home. It cannot be portable from one place to another place easily. The very first “programmable calculator/computer” was marketed in the second half of the 1960s, starting with the Italian machinery Programma 101 (1965) computer at typewriter size.
More desktop models were introduced in 1971, leading to a model programmable in BASIC in 1972. This one used a smaller version of a minicomputer design based on read-only memory (ROM) and had small one-line LED alphanumeric displays. They could draw computer graphics with a plotter.
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The hard disk was invented on September 13, 1956 by IBM team led by Rey Johnson (considered as “father” of the disk drive). Earlier hard disk drives were large and cumbersome devices.