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  • Brainly User
2015-01-09T11:03:17+05:30
RAM :- A random-access memory device allows data items to be read and written in roughly the same amount of time regardless of the order in which data items are accessed..........
                                                                                                                           ROM :-
Read-only memory (ROM) is a class of storage medium used in computers and other electronic devices.............

 Cache:-  In computing,  cache is a component that transparently stores data so that future requests for that data can be served faster.        

 Hard disk :- It stores all our data ........ It is very important for saving large amount of data ...........................................................................           
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