Memory

   The working place in computer where all data is stored is called memory. There are small cells called bit. In these cell data is stored in the form of 0 & 1.

 

Primary Memory

   Primary Memory consists of RAM (random access memory) and ROM (read only memory). In this type of primary memory data is not stored permanently, it is stored temporarily. After getting off data is erased from the memory of computer.” These are considered as short term memory”

 

Secondary Memory

   Secondary memory (or secondary storage) is the slowest and cheapest form of memory. It cannot be processed directly by the CPU. It must first be copied into primary storage (also known as RAM). Secondary memory devices include magnetic disks like hard drives and floppy disks; optical disks such as CDs and CD ROMs; and magnetic tapes, which were the first forms of secondary memory

   It can be used as a permanent memory; because even the computer is turned off we can retrieve the information. Secondary storage can be thought of as "long term memory"