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Definition
A computer is a programmable electronic device designed to admit data, perform approved mathematical and reasonable operations at high speed, and display the results of the procedures, all under the control of software. Mainframes, desktop and laptop computers, tablets and smartphones are a few of the several types of personal computers. An electronic machine which assists with solving problems quickly and easily. It solves problems according to instructions given to it by the computer consumer called programs or software. It is a digital machine(that uses binary digits) found in all field

Automation
Most humans have a problem with math. To show this, try doing 584 x 3,220 in your head. It really is hard to remember all the steps! People made tools to help them bear in mind where they were in a mathematics problem. The other problem people have is that they have to do the same problem again and again and once more. A cashier were required to make change every day in her head or with a piece of paper. That got a lot of time and made flaws. So, people made calculators that does those same things again and again. This part of computer background is named the "history of robotic calculation," which is a fancy term for "the history of machines which make it easy for me to do this same maths problem over and over without making faults."The abacus, the slip rule, the astrolabe and the Antikythera mechanism (which dates from about 150-100 BC) are examples of automated calculation machines.

Programming
People do not want a machine that could do the same thing again and again. For example, a music box is a machine that performs the same music again and again. Some people wanted to be able to tell their machine to do various things. For instance, they wanted to inform the music box to experiment with different music every time. They wanted to have the ability to program the music field- to order the music box to learn different music. This part of computer history is named the "history of programmable machines" which really is a fancy word for "The history of machines that I can order to do different things if I know how to speak their language."One of the first types of this was built by Hero of Alexandria (c. 10-70 AD). He built a mechanised theatre which performed a play sustained ten minutes and was handled by a complex system of ropes and drums. These ropes and drums were the words of the machine- they advised what the device did and when. Some people argue that this is the first programmable machine.Historians disagree on which early machines are "computer systems". Many say the "castle clock", an astronomical clock developed by Al-Jazari in 1206, is the first known programmable analog computer. The space of night and day could be tweaked every day in order to account for the changing measures of day and night over summer and winter. Some matter this daily modification as computer programming.Others say the first computer was created by Charles Babbage. Ada Lovelace is known as to be the first programmer.

The Processing Era
By the end of the center Ages, people in European countries thought math and executive were more important. In 1623, Wilhelm Schickard made a mechanical calculator. Other Europeans made more calculators after him. These were not modern personal computers because they could only add, subtract, and increase- you could not change what they do to make them do something like play Tetris. Because of this, we say these were not programmable. Now engineers use computers to design and plan.In 1801, Joseph Marie Jacquard used punched paper cards to tell his textile loom what kind of design to weave. He could use punch cards to tell the loom how to proceed, and he could change the punch credit cards, which means he could program the loom to weave the routine he wanted. This implies the loom was programmable.Charles Babbage wished to make an identical machine that could estimate. He called it "The Analytical Engine".[8] Because Babbage did not can pay for and always transformed his design when he had a better idea, he never built his Analytical Engine unit.As time went on, computer systems were used more. People get bored easily doing a similar thing again and again. Imagine spending your life writing things down on index cards, saving them, and then having to go see them again. The U.S. Census Bureau in 1890 got hundreds of men and women doing that. It was expensive, and information took quite a while. Then an engineer worked out how to make machines execute a lot of the task. Herman Hollerith invented a tabulating machine that would automatically accumulate information that the Census bureau collected. The Processing Tabulating Recording Organization (which later became IBM) made his machines. They leased the machines instead of selling them. Producers of machines possessed long helped their users understand and repair them, and CTR's technology support was especially good.Because of machines like this, new ways of talking to these machines were created, and new types of machines were created, and finally the computer as we know it was created.

Analog and Digital Computers
In the first 50 % of the 20th hundred years, scientists started out using computers, largely because scientists acquired a lot of math to determine and wished to spend more of their time thinking about technology questions rather than expending hours adding numbers collectively. For example, if indeed they had to establish a rocket dispatch, they needed to do a lot of math to be sure the rocket did the trick right. So they come up with personal computers. These analog computer systems used analog circuits, which made them very difficult to program. In the 1930s, they created digital personal computers, and soon made them easier to program. However this is not the case as much consecutive tries have been made to bring arithmetic logic to l3.Analogue computer systems are mechanical or electronic devices which solve problems. some are being used to regulate machines.