Differences between primary memory and secondary memory.

Primary Memory	Secondary Memory
Primary memory stores the programs to be executed, holds the input data that is to be processed and the intermediate results of any calculation when the processing is being done.	secondary memory is used for mass storage or data, information and programs.
Data or information in primary memory are temporary.	data or information stored in a secondary memory are stored permanently
The capacity of primary memory is lesser than secondary memory.	the capacity of secondary memory is more than primary memory.
Primary memory is faster than secondary memory.	Secondary memory is slower in comparison with primary memory.
Primary is costly than secondary memory.	Secondary memory is cheaper than primary memory.