This is in contrast to physical hardware, from which the system is built and actually performs the work.
In computer science and software engineering, computer software is all information processed by computer systems, programs and data.
This involves passing instructions from the application software, through the system software, to the hardware which ultimately receives the instruction as machine code.
An instruction may also invoke one of many input or output operations, for example displaying some text on a computer screen; causing state changes which should be visible to the user.
Data movement is typically from one place in memory to another.
Sometimes it involves moving data between memory and registers which enable high-speed data access in the CPU.
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