Difference between primary memory and secondary memory?

1.	Difference between primary memory and secondary memory?
Answer» \tPrimary memory is also called internal memory whereas Secondary memory is also known as a Backup memory or Auxiliary memory.\tPrimary memory can be accessed by the data bus whereas Secondary memory is accessed by I/O channels.\tPrimary memory data is directly accessed by the processing unit whereas Secondary memory data cannot be accessed directly by the processor.\tPrimary memory is costlier than secondary memory whereas Secondary memory is cheaper compared to primary memory.\tPrimary memory is both volatile & nonvolatile whereas Secondary memory is always a non-volatile memory.

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