An integrated circuit is a small silicon semiconductor device, called chip containing electrical component such as transistor, diode resistor and capacitor.

CPU is an electric brain to computer which process and controls all the activity of computer system. The section of CPU are:
  • Control unit
  • Arithmetic and logic unit
  • Memory unit
ROM RAM
i. It stands for Read only memory i. It stands for Random Access memory.
ii. It is non-volatile (permanent) memory. ii. It is volatile (temporary) memory.
iii. It's types are PROM, EPROM, EEPROM etc. iii. It's types are SRAM, DRAM etc.
Random Access Memory is called volatile memory because its data contents remain permanent and do not loss as soon as electricity in not supplied.
Read Only Memory is called non volatile memory because its data contents remain permanent and do not loss as soon as electricity is not supplied.