What is computer?

Computer is a very versatile electronic machine. Man has ever created. Computer have made a great impact on our everyday life. Their presence is felt in almost every walk of life be like IT, HOME ,SCHOOL, COLLEGE, OFFICE, INDUSTRY, HOSPITAL, BANK, RETAIL STORES, RAILWAYS, RESEARCH and DESIGN ORGANISATIONS, ETC.

What does computer do?

Computers can perform four general operations, which comprise the information processing cycle.

• INPUT
• PROCESS
• OUTPUT
• STORAGE

• INPUT:

Input is the raw information entered into a computer from the input devices. It is the collection of letters, numbers, images etc.

• PROCESS:

Process is the operation of data as per given instruction. It is totally internal process of the computer system.

• OUTPUT:

Output is the processed data given by computer after data processing. Output is also called as Result. We can save these results in the storage devices for the future use.

computer classification: 

Computers differ based on their data processing abilities. They are classified according to purpose, data handling and functionality

According to functionality, computers are classified as:

• Analog computer: A computer that represents numbers by some continuously variable physical quantity, whose variations mimic some system's properties being modeled.

• Personal computer: A personal computer is a computer small and low cost. The term "personal computer" is used to describe desktop computer.

• Mini computer: A minicomputer isn't very mini. At least, not in the way most of us think of mini. You know how big your personal computer is and its related family.

• Mainframe: It refers to the kind of large computer that runs an entire corporation.

• Super computer: It is the most giant, fastest, and most expansive computers on earth.