Why primary memory is termed as \'destructive write\' memory but \' non-destructive read\' memory?

Why primary memory is termed as \'destructive write\' memory but \' no

1.	Why primary memory is termed as \'destructive write\' memory but \' non-destructive read\' memory?
Answer» Primary memory is termed as destructive write memory because the memory stored in it is not permanent. Memory is only saved only during the working of the computer and after the work is completed, it gets erased with out the users command. Each time at the time if re-start it get cleared and refreshed.