PRIMARY MEMORY OR STORAGE:

Random Access Memory (RAM):

The RAM of the computer is divided into numerous locations which are uniquely numbered or addressed. Information and data is stored in these unique memory locations and retrieved as required form these location art random (without a sequential search for the particular location) by the Operating system Random Access Memory Chip is a Dynamic Memory Chip (DRAM)

The contents of RAM need to be stored periodically on to a secondary memory since power failure will erase the contents of RAM because of which this memory is also called volatile memory.

Read Only Memory (ROM):

The storage elements in the ROM are available to the user. These elements contain certain pre-coded instructions which are used by the computer. These storage locations are only read and cannot be erased or changed.

Cache (Cache Memory):

A Cache is a specially designed buffer storage used to improve computer performance by reducing access time. It holds instructions and data that are likely to be needed for next operation by the processor. The cache copies frequently accessed data and instructions from primary storage (main memory) or secondary storage (disks).