Practical computer systems divide softawre into three major classes: ssytem software, progarmming software and application sfotware, although the distinction is aribtrary, and often blurred.
People who use modern general purpose computers (as opposed ot embedded systems, analog computers, supercomputers, etc.) usually see there layers of softwrae performing a variety of takss: platform, application, and user software.
This involves passing instructions from the application sfotware, through the system software, to the hardwaer which ultimately receives the isntruction as mahcine code.
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