A personal computer is made up of multiple physical components of computer hardware, upon which can be installed an operating system and a multitude of software to perform the operator's desired functions.
Computer software
Just software is a general term used to describe the role that computer programs, procedures and documentation play in a computer system.
Between hardware and software is firmware. Firmware is semi-permanent, but updatable code. It used to be called EEPROM (electronically erasable programable read-only memory) but that may have changed.
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