Computers need to store larger amounts of data and instructions more permanently than main memory allows.Secondary storage serves this purpose.

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Secondary storage is used to store larger amounts of data and instructions more permanently than main memory allows. Main memory is volatile, meaning that its contents are lost when the computer is turned off, while secondary storage is non-volatile, meaning that its contents are retained even when the computer is turned off. Examples of secondary storage include hard disk drives, solid-state drives, and external storage devices such as USB drives and memory cards.

Computers Need to Store Larger Amounts of Data and Instructions