?Central Processing UnitIt is the main part of the computer. CPU chip or main processor is that part in the computer which performs or executes all the instructions or programs. The Central Processing Unit (CPU), the principal part of any digital computer system, generally composed of the main memory, control unit, and arithmetic-logic unit. It constitutes the physical heart of the entire computer system, it is linked to various peripheral equipment, including input/output devices and auxiliary storage units. In modern computers, the CPU is contained on an integrated circuit chip called a microprocessor. The control unit part controls the input and output devices. Arithmetic-logic units do basic operations like addition, multiplication, and division. A primary storage device is a medium that holds a memory for a short period of time while a computer is running. Therefore, computers add and compare its data in the CPU. 1. Memory:Computer memory is a generic term for all of the different types of data storage technology that a computer may use, including RAM, ROM, and flash memory. 2. Hard disk: Hard disk, Magnetic storage medium for a microcomputer. Hard disks are flat, circular plates made of aluminum or glass and coated with magnetic material. Hard disks for personal computers can store up to several gigabytes (billions of bytes) of information. 3. Floppy disk:Alternatively referred to as a floppy or floppy disk, a floppy diskette is a type of storage media capable of storing electronic data, like a computer file.