What is Memory? (IT Tools & Business System)

Memory:-
                   Memory is the important part of computer. All the data and information is a permanently stored.
              there are two types of memory in computer.

1. Primary Memory
2. Secondary Memory

1. Primary Memory- It is also called internal memory. It is primary storage location of the computer.

Primary memory are two types- 

1. RAM (Random Access Memory)- It is main working memory where all the processing data is done. It is directly access by CPU. It is also called Volatile Memory. (Volatile means when the power supply is switched off then everything get lost (erase). It is also called Read/Write memory because use we can read and write on this type of memory. 

RAM are also two types-
1. SRAM (Static Random Access Memory)-

• Very low access time.
• No need of refreshing.
• It is used in cache memory.
• SRAM times more expensive.
• Four times more expensive.

2. DRAM (Dynamic Random Access Memory)-

• Low cast
• Consume less power.
• Need to be refreshing.
• It is used in main memory.
• Can store four times as much.

2. ROM (Read Only Memory)-  The user can not write on this type of memory. It is a Non-volatile memory that means no effect of power supply. The small program is stored in ROM that is read by the system every time when it startup. 

The example of ROM is BIOS chip. 

ROM are also three types=

1. PROM (Programmable Read Only Memory)-   The content of this memory can be programmed with the help of given instruction. 

2. EPROM (Erasable Programmable Read Only Memory)- It is also a PROM the content of this memory can be erased by ultra violet rays (U.V Rays) and new program is re-written. 

3. EEPROM (Electrically Erasable Programmable Read Only Memory)-  The content of this Memory can be erased using electrical Pulse.