Computer memory 1.Primary Memory 2.Secondary Memory

1. Computer memory refers to storage area
where data is stored. It is of two types −
 Primary Memory
 Secondary Memory

2. Primary memory is the main memory of computer
present in motherboard. Primary memory is of two
types as shown in the image below.
Primary memory
Primary memory
RAM
(Random Access Memory)
ROM
(Read Only Memory)

3. (RAM)Random Access Memory
RAM is referred as temporary memory, in which, information stored is
lost once computer is turned off. It is a volatile memory. Instructions
written in this memory can be modified; hence it is also known as
programmable memory. The two types of RAM are Static RAM (faster
and costlier) and Dynamic RAM.
RAM
(Random Access
Memory)
Static RAM Dynamic RAM

4.  (ROM)Read Only Memory
ROM is referred as permanent memory, in which information stored is
available even if computer is turned off. Instructions stored in this
memory can only be read and cannot be modified. Mostly ROM has a
start-up instruction which is executed every time when computer is
switched on. Types of ROM are PROM (Programmable Read Only
Memory), EPROM (Erasable PROM), EEPROM (Electrically
Erasable PROM) and flash memory.

5. Secondary memory
Sometimes when data to be processed is large, it cannot fit in
primary memory as it is limited, in such cases, we use supplement
memory or secondary memory. Secondary memory helps to store
information permanently and is non-volatile. Examples of secondary
storage memory are compact disk, floppy disk, pen drive, external
hard drive, etc.

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