A computer is a programmable machine. The two principal characteristics of a computer are: It again responds to a specific set of instructions in a well-defined manner and it can execute a prerecorded list of instructions (a program).
Modern Computers Defined
Modern computers are automated and digital. The actual machinery - wires, transistors, and circuits - is hardware; the instructions and data are called software.
All general-purpose computers need to have the following hardware components:
Memory: enables a computer to store, at least temporarily, data together with programs.
Mass storage device: allows a computer to permanently retain large amounts of data. Usual mass storage devices include solid state drives (SSDs) or disk motoring and tape drives.
Input device: usually a keyboard and mouse, the main input device is the conduit through which data and instructions enter a computer.
Expenditure device: a display screen, printer, or other device that lets you see what the laptop has accomplished.
Central processing unit (CPU): the heart of the computer, this is the region that actually executes instructions.
In addition to these components, many others make it possible for the basic components to dedicate yourself together efficiently. For example , every computer requires a bus that transmits data in part of the computer to another.
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Computer Classification: By Size and Power
Most people web-based a personal computer (PC) with the phrase computer. A PC is a small and pretty cheap computer designed for an individual use. PCs are based on the microprocessor technology that enables vendors to put an entire CPU on one chip.
Personal computers at home can be used for a number of different balms including games, word processing, accounting and other tasks.
Computers are generally classified just by size and power as follows, although there is considerable overlap. The differences between personal pc classifications generally get smaller as technology advances, creating smaller and more successful and cost-friendly components.
Personal computer: a small, single-user computer based on a microprocessor. Provided microprocessor, a personal computer has a keyboard for entering data, a monitor meant for displaying information, and a storage device for saving data.
Workstation: a powerful, single-user desktop computer. A workstation is like a personal computer, but it has a more powerful microprocessor and a higher-quality monitor.
Minicomputer: a multi-user computer capable of supporting from 10 to many hundreds users simultaneously.
Mainframe: a powerful multi-user computer capable of supporting many hundreds or thousands about users simultaneously.
Supercomputer: an extremely fast computer that can perform hundreds of millions of instruction manuals per second.
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