Question

what is use of secondary memory

Answer 1

Secondary memory is where programs and data are kept on a long-term basis. Common secondary storage devices are the hard disk and optical disks. The hard disk has enormous storage capacity compared to main memory. The hard disk is usually contained inside the case of a computer.
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Answer 2

Secondary memory is where programs and data are kept on a long-term basis. Common secondary storage devices are the hard disk andoptical disks. The hard disk has enormous storage capacity compared to main memory. The hard disk is usually contained inside the case of a computer.
Secondary storage devices are a very useful component. The majority of secondary storage devices are used for a very simple task:
backing up data. ...
Another common use of secondary storage devices is to serve as an external hard drive.

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