Computer is a electronic device which make our work easiest and faster. “COMPUTER” word is derived from a Latin word “compute” which means to calculate. computer takes input provided by user and after processing, it provides final information through output devices. when idea of computer evolved. then, its primary aim was just to do calculation. but now a day computer does work beyond thinking.
Computer take place three types of memory-
COMPUTER “MEMORY”
= primary memory
= Secondary memory
= cache memory

primary memory:

• RAM-Random access memory.
• ROM-Read only memory.

RAM-

it stands for random access memory which is very fast memory. this memory has been divided into a number of location knows cell each memory has its address

• which is useful for retrieval
• this memory is temporary and when the computer go off very thing is wiped out that is why it is called volatile memory. it is called as read write because we can modify the data.
  FOR EXAMPLE=
  SRAM- static random access memory.
  DRAM- Dynamic random access memory.

ROM–

The term stand for read only memory. hence, we can write is this memory instruction can be read on it but can be changed. hence, it is called man-volatile memory.
FOR EXAMPLE=
PROM-programmable read only memory.
EPROM- erasable programmable read only memory.
EEPROM- electrically erasable programmable read only memory.
EAROM- electrically alterable read only memory.
FLASH-flash memory.

Secondary memory:

This memory is also a computer memory. The memory which do not x-ray by CPU. This memory data is always store in the computer. FOR EXAMPIE=

• =DVD- digital video disk.
• =CD-compact disk.
• =HD-high disk.

Cache memory:

Cache memory store that data and profile which is often use by CPU. when CPU want a data, then first of all, it found that data in cache memory.

types of cache memory-
= L1 cache-
(1) this memory is very small.
(2) this size is 2KB to 64KB.

=L2 cache
(1) this size is 256KB to 521KB.

=L3 cache
(1) this size is 1MB to 8MB.

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