Operating System (OS)
The primary purpose of an operating system is:

To allow people to use the computer
To make computers easier to use
To make the most efficient use of the computer hardware
To keep systems programmers employed

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Operating System (OS)
Multiprogramming

is a method of memory allocation by which the program is subdivided into equal portions, or pages and core is subdivided into equal portions or blocks.
None of these
is a method of allocating processor time.
consists of those addresses that may be generated by a processor during execution of a computation.
allows multiple programs to reside in separate areas of core at the time.

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