What's is secondary memory ?

Secondary memory, also known as external memory or auxiliary memory, refers to the storage devices that are used to store data and programs permanently. Unlike primary memory (RAM), which is volatile and loses its data when the power is turned off, secondary memory retains data even when the power is off. Examples of secondary memory include hard disk drives (HDD), solid-state drives (SSD), optical discs (CDs, DVDs), USB flash drives, and magnetic tapes. Secondary memory is typically slower than primary memory but has a larger storage capacity. It is used for long-term storage of data and programs that are not currently being used by the computer's processor.