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Definition
A computer is a programmable digital camera designed to agree to data, perform recommended mathematical and reasonable operations at high speed, and display the results of the operations, all under the control of software. Mainframes, desktop and laptops, tablets and smartphones are some of the several types of personal computers. An electric machine which helps in solving problems quickly and easily. It solves problems relating to instructions given to it by the computer end user called programs or software. It is a digital machine(that uses binary digits) used in all field

Automation
Most humans have trouble with math. To show this, try doing 584 x 3,220 in your head. It really is hard to keep in mind all the steps! People made tools to help them keep in mind where they were in a math problem. The other problem people have is that they need to do the same problem again and again and once more. A cashier were required to make change every day in her mind or with a bit of paper. That got lots of time and made mistakes. So, people made calculators that performed those same things again and again. This part of computer history is called the "history of automatic calculation," which really is a fancy term for "the annals of machines that make it easy for me to get this done same maths problem over and over without making faults."The abacus, the slip rule, the astrolabe and the Antikythera mechanism (which times from about 150-100 BC) are types of automated calculation machines.

Programming
People do not need a machine that could do a similar thing again and again. For example, a music package is a machine that takes on the same music again and again. Some people wished to be able to notify their machine to do various things. For example, they wished to inform the music pack to experiment with different music each time. They wanted to be able to program the music pack- to order the music pack to play different music. This part of computer record is called the "history of programmable machines" which is a fancy saying for "The history of machines that I can order to do different things if I know how to speak their terms."Among the first types of this is built by Hero of Alexandria (c. 10-70 Advertising). He built a mechanised theater which performed a play long lasting ten minutes and was run by a complicated system of ropes and drums. These ropes and drums were the terminology of the machine- they informed what the device did so when. Some people claim that is the first programmable machine.Historians disagree which early machines are "personal computers". Many say the "castle clock", an astronomical clock created by Al-Jazari in 1206, is the first known programmable analog computer. The length of night and day could be adjusted every day to be able to take into account the changing lengths of day and night over summer and winter. Some count number this daily modification as education.Others say the first computer was created by Charles Babbage. Ada Lovelace is considered to be the first programmer.

The Computing Era
By the end of the center Age groups, people in Europe thought mathematics and executive were more important. In 1623, Wilhelm Schickard made a mechanical calculator. Other Europeans made more calculators after him. They were not modern personal computers because they could only add, subtract, and increase- you cannot change what they did to make them do something like play Tetris. Because of this, we say they were not programmable. Now technical engineers use computers to create and plan.In 1801, Joseph Marie Jacquard used punched newspaper cards in order to his textile loom the type of structure to weave. He could use punch cards to tell the loom what to do, and he could change the punch credit cards, which means he could program the loom to weave the structure he wanted. This means the loom was programmable.Charles Babbage wished to make a similar machine which could determine. He called it "The Analytical Engine".[8] Because Babbage didn't have enough money and always improved his design when he previously a much better idea, he never built his Analytical Engine motor.As time continued, pcs were used more. People get uninterested easily doing the same thing over and over. Imagine spending your life writing things down on index cards, holding them, and then needing to go see them again. The U.S. Census Bureau in 1890 possessed hundreds of people doing that. It had been expensive, and studies took quite a while. Then an engineer worked out steps to make machines do a lot of the work. Herman Hollerith developed a tabulating machine that could automatically accumulate information that the Census bureau gathered. The Processing Tabulating Recording Corporation (which later became IBM) made his machines. They leased the machines rather than selling them. Manufacturers of machines experienced long helped their users understand and repair them, and CTR's technology support was especially good.Because of machines like this, new means of talking to these machines were created, and new types of machines were invented, and finally the computer as we realize it was created.

Analog and Digital Computers
In the first 1 / 2 of the 20th century, scientists started out using computers, generally because scientists experienced a whole lot of math to figure out and wished to spend more of their own time thinking about research questions rather than expending hours adding numbers mutually. For example, if they had to release a rocket ship, they needed to do a great deal of math to make certain the rocket did the trick right. So they put together pcs. These analog computer systems used analog circuits, which made them very hard to program. Inside the 1930s, they invented digital computer systems, and soon made them better to program. Financial firms false as many consecutive makes an attempt have been designed to bring arithmetic logic to l3.Analogue personal computers are mechanised or electronic devices which solve problems. some are being used to regulate machines.