COMPUTER- Commanly Operating Machine Particularly Use in Trade Education & Research.
Computer is an Electronic device, that can be instructed to carry out sequences of arithmetic, logical operations automatically by computer programming.
In 21st century, computers have the ability to follow various generalized set of operations, known as programs. The programs enables the computers to perform a huge amount of tasks. Complete computer inclues the hardware and operating system i.e main software and peripheral equipment required and used for full operation can be referred as a computer system.
*Prerecorded list of instructions can be excuted.
*It can quickly store and retrieve large amount of data.
In Early 19th century, english mechanical engineer and polymath "Charles Babbage" started the concept of a programmable computer as well as he invent the first mechanical computer and Supposed to be the "father of Computer".
In modern Era, The Computers are used as controlling system for a wide variety of industrial work purpose, like microwave ovens and remote controls, factory devices such as industrial robots and computer-aided design, and also uses as an general purpose devices like personal computers and Smartphones, Consumer devices are also get to be connected to resolve their quiry and make them satisfied. Internet runs on computers and it connects hundreds of millions of other computers and their users collectively.
Basic Parts of Computer:
-Central Processing Unit (CPU)- CPU is the heart of computer, it executes instructions organized in programs "software" which tells to computer what to do.
-Memory: It Enables a computer to store, temporarily data, programs, and intermediate results, we can increase the storage by adding Hard-Disk as according to our need.
-Input device: An Input device is mainly an hardware device, it sends data to our system by means of which you can interact and control it.
-Output device: The display screen, printer and other device that lets you see what the computer has accomplished are output devices. 
In Modern time, computers are used for performing calculations and many more... But in Ancient time for performing calculation simple manual devices like counting Frame helps people in doing calculations. Early in the Industrial Revolution, Few mechanical devices were introduced to automate long as well as heavy tasks, such as guiding patterns for looms. More electrical machines specialized, Analog calculations in 20th century. During World War II First digital electronic calculating machine was developed. First semiconductor transistor was developed in 1940s which was followed by the silicon-based MOSFET (MOS transistor) and monolithic integrated circuit (IC) chip technologies in the 1950s,The microprocessor and the microcomputer revolution in the 1970s. The speed, power and versatility of computers have been increasing dramatically ever since then, with MOS transistor counts increasing at a rapid pace, leading to the Digital Revolution during the late 20th to early 21st centuries.
Types Of Computers: Computers are classified by size and power, as follows:
-Personal computer
-Workstation
-Minicomputer
-Mainframe
-Supercomputer
*Personal computer- It is a multi-task computer whose size, capabilities and price makes it more suitable for personal use. Personal computers are intended to be operated directly by an end user, rather than by a computer expert or technician.
*Workstation- Workstation is a type of computer Generally, used for engineering applications (CAD/CAM), desktop publishing, software development, and other types of applications that requires a moderate amount of computing power and relatively high quality graphics capabilities. Workstations generally come with a large, high-resolution graphical screen, high RAM, built-in network support, and a graphical user interface.
*Minicomputer- It is a medium size computer. In previous decades, the distinction between large minicomputers and small mainframes has blurred, however, distinction between small minicomputers and workstations. But, a minicomputer is a multiprocessing system capable of supporting from up to 200 users simultaneously.
*Mainframe- Mainframe computers are big centralized machine which contains the big memory, sufficient storage, multiple High grade processors. so it has ultra processing power in comparision to standard computer systems. So, the mainframe computer systems are important because it is capable to execute multiple complex programs concurrently at the ultra speed.
*Supercomputer- It is a broad term for one of the fastest computers currently available. Supercomputers are very expensive and are employed for specialized applications that require immense amounts of mathematical calculations etc..
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