What is a Computer
A computer is a very versatile electronic machine created by man.Computer have made a great impact on our everyday life. Their presence is felt in almost every aspect of life be it home,school,college,office industry,hospital,bank,retail,stores,railways,research and design organization etc.
A computer is basically a programmable computing machine.Earlier computer were used for complex computation. They were costly and hence only large organization could afford them. Then technological advancements in design and fabrication of semiconductor devices,namely,the microprocessor has made it possible for smaller organization and even individual's to afford. These computers cannot be asked for faster calculations but also for storing and retrieving information. They can be used to control chemical processes and machines. They can even measure and display physical and electrical quantities and send photographs electronically.
The word 'computer' comes from the word compute, which means to calculate. So, a computer is normally considered to be a calculating device that can perform arithmetic operation at an enormous speed. But more accurately , it may be defined as a device that operates upon data for calculation.
There are two basic types of computer
- Analog
- Digital
- ANALOG COMPUTER :Analog computers handle or process information of a physical nature. For instance, temperature, pressure etc. These are based on the measuring of analog or equivalent physical value.
- DIGITAL COMPUTER : Digital computer process information which is essentially in a binary or two-state form,namely,zero and one. In computing terms,we mostly refer to the digital type of computers.
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