MEMORY
Memory is a storage device which stores the information. Sometimes memory is confused with the hard disk memory. Sometimes unallocated space of the hard disk is used as virtual memory also known as page file. This type of memory is a temporary memory and is used actual memory is less and requires some additional memory to perform a specific task. There are several kinds of memory such as Random-access memory (RAM), Read-only memory (ROM), Cache memory, and Flash memory.

Random Access Memory is main memory and it is also called volatile memory. There are two types of main memory such as Static Random Access Memory (SRAM) and Dynamic Random Access Memory (DRAM). Read Only Memory (ROM) is another type of memory and it is also called non-volatile memory or Firmware. There are several types of ROM available such as EPROM (Erasable Programmable ROM) and EAROM (Electrically Alterable ROM). More RAM in the computer more faster computer works. Today at least requirement of a modern PC is 64 RAM.

Cache Memory is a very fast memory. There are two type of cache memory such as Cache Layer 1 and Cache Layer 2. Flash memory is type of non-volatile memories and that are rewritable.