Describe about different components of a computer.

    All general-purpose computer requires some hardware components. Those are as follows -

Input Unit - Through this unit, data and instructions are entered into the computer. Keyboard and mouse are the two most common input devices of a computer. The other input devices are light pen, joy stick, scanner, touch screen, MICR, OMR and barcode reader etc.

Output Unit - Through this unit the results are communicated to the user. Some common output devices are - display screen or monitor, printer, plotter etc.

Central Processing Unit (CPU) - The CPU is called the brain of a computer. It is responsible for carrying out arithmetic and logic functions as well as execution of instructions. Modern CPU's are called 'integrated chips'. The CPU is composed of millions of transistors. The CPU consists of two major components - ALU ans CU. The actual functions of a computer take place in the arithmetic and logic unit (ALU). The control unit (CU) controls the entire operation of the computer. It controls all other devices such as memory, input and output devices connected to the CPU. It gives instruction to the ALU what operation is to be performed. It generates timing and control signals, and provides them for all operations. It controls the data flow between the CPU and the peripherals including the memory.

Memory - The memory enables a computer to store the data and programs temporarily. Every computer comes with a certain amount of physical memory. It is usually referred to as main memory or RAM (Random Access Memory). 

        We, in brief, can say that a computer consists of the components called input unit, output unit, the CPU and the memory.