Computer is discovered by William Oughtred in 1622. But the first computer resembling today's modern machines was the Analytical Engine, a device conceived and designed by British mathematician Charles Babbage between 1833 and 1871

What is Computer ?
A computer is a machine that can be instructed to carry out sequences of arithmetic or logical operations automatically via computer programming. Modern computers have the ability to follow generalized sets of operations, called programs. These programs enable computers to perform an extremely wide range of tasks.
What is full Form of Computer ?
Some people say that COMPUTER stands for Common Operating Machine Purposely Used for Technological and Educational Research.
A computer is a general purpose electronic device that is used to perform arithmetic and logical operations automatically.
What are the sorts or types of PCs ?
Find out about various sorts of PCs that exist . This are following :-1. Supercomputer
Supercomputers are the quickest and the most costly PCs. These gigantic PCs are utilized to fathom exceptionally complex science and designing issues. Supercomputers get their preparing power by exploiting equal handling; they use heaps of CPUs simultaneously on one issue. A regular supercomputer can do up to ten trillion individual estimations consistently. Model Supercomputers :- K Computer ,Columbia
2. Centralized server
Centralized server (casually, "huge iron") PCs are like supercomputers in numerous perspectives, the primary contrast between them is the way that a supercomputer utilizes all its crude capacity to zero in on not many assignments, while a centralized computer perform thousands or millions of activities simultaneously. Because of its temperament, centralized computers are frequently utilized by enormous associations for mass information preparing, for example, evaluation, industry and customer measurements, undertaking asset arranging and exchange handling.
3. Worker Computer
A worker is a focal PC that contains assortments of information and projects. Likewise called an organization worker, this framework permits all associated clients to share and store electronic information and applications. Two significant sorts of workers are document workers and application workers.
Workers are a stage beneath supercomputers since they don't zero in on attempting to tackle one exceptionally complex issue yet attempt to settle numerous comparable littler ones. A case of workers would be the PCs that Wikipedia stores its reference book on. Those PCs need to proceed to discover the page you're searching for and send it to you. In itself, it is anything but a major errand, however it turns into an occupation for a worker when the PCs need to proceed to discover loads of pages for many individuals and send them to the ideal spot. A few workers, similar to the ones Google utilizes for something like Google Documents, have applications on them rather than just records, as Wikipedia.
4.Workstation Computer
Workstations are very good quality, costly PCs that are made for more mind boggling methods and are expected for each client in turn. A portion of the perplexing systems comprise of science, math and designing counts and are helpful for PC plan and assembling. Workstations are some of the time inappropriately named for showcasing reasons. Genuine workstations are not generally sold in retail, however this is beginning to change; Apple's Mac Pro would be viewed as a workstation.
The film Toy Story was made on a lot of Sun (Sparc) workstations
5.Personal Computer or PC
PC is a contraction for a Personal Computer, it is otherwise called a Microcomputer. Its physical qualities and minimal effort are engaging and valuable for its clients. The abilities of a PC have changed extraordinarily since the presentation of electronic PCs. By the mid 1970s, individuals in scholarly or research foundations had the open door for single-individual utilization of a PC framework in intuitive mode for expanded spans, despite the fact that these frameworks would even now have been too costly to possibly be claimed by a solitary person. The presentation of the microchip, a solitary chip with all the hardware that in the past involved enormous cupboards, prompted the expansion of PCs after around 1975. Early PCs, by and large called microcomputers, sold regularly in unit structure and in restricted volumes and were of intrigue generally to specialists and experts. By the last part of the 1970s, mass-market per-amassed PCs permitted a more extensive scope of individuals to utilize PCs, zeroing in additional on programming applications and less on the improvement of the processor equipment. All through the 1970s and 1980s, home PCs were created for family use, offering some close to home profitability, programming and games, while to some degree bigger and more costly frameworks (albeit still minimal effort contrasted and minicomputers and centralized computers) were focused on office and independent company use.
Today a PC is an inside and out gadget that can be utilized as an efficiency instrument, a media worker and a gaming machine. The measured development of the PC permits parts to be effortlessly traded out when broken or updating.
6.Microcontroller
Microcontrollers are little PCs that empower the client to store information and execute straightforward orders and errands. These single circuit gadgets have negligible memory and program length yet are typically intended to be truly adept at playing out a specialty task. Numerous such frameworks are known as installed frameworks. The PC in your vehicle, for instance, is an implanted framework. A typical microcontroller that one may run over is called Arduino.
7.Smartphone
Do you know? Your cell phone is a PC! Most cell phones run iOS or Android. Android is a working framework that depends on Linux. Cell phones are getting exponentially quicker and furthermore have an exponentially expanding information limit. These two gadgets have numerous restrictions, for example, preparing power, memory, energy use and screen size. They likewise have distinctive information techniques, for example, numeric keypad small QWERTY keypad with route keys or contact signals, an omscreen and voice input.
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