whats ram

RAM:(Random Access Memory:
why it's called random did any body think about this word.Means by it's name we are understanding than any time it will by accessed by processor b/c the closest to the processor Memory is Registers which is short memory but the fastest memory than others it's used for ALU,(additions,subtraction,Boolean operations).but when the processor did not find it's required data to access it's then goes to "CACHE" "Memory"
Cache is also a type of fast and small memory after the registers .different levels are there (L1,L2 and L3).If the processor find it's data in L1 it's call L1 hit memory else L1 miss memory.And in this condition the processor access it's required data or Write from the memory.If the processor not find in L1 and L2 than it access from the RAM.
That's why we call it Random Access Memory any time the processor will access the RAM.when it not find it's data OR required information in the Memories Above the RAM.