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The physical parts of a Computer are called hardware. Yes, hardware physically exists. It can be seen and we can touch the physical parts. These physical parts are repairable and replaceable.  Hardware components are manufactured on an  industrial scale. Such components are of great value for Computer users.  Each and every unit of hardware has a function. There is a hardware for capturing information. Hardware that captures information is called  the input unit. Examples of input units are keyboard and mouse. Separate hardware is there for processing of data. Data processing work is carried out by the Central Processing Unit ( CPU ). The CPU has two sections ALU ( Arithmetic Logic Unit ) and CU ( Control Unit ).  The ALU carries out arithmetic operations. Besides it also carries out comparisons of digits. Comparison Operations are called Logical Operations.  Computer operations cannot be conducted in any way. There has to be a discipline. Disciplinary cont...

Mainly there are four kinds of computers. They are: Personal Computers: Personal Computers are also called Home Computers. Some people call them Microcomputers. Personal Computers are the simplest computers. They are not costly also. Microcomputers or Personal Computers are all-rounders. They are used by professionals, record keepers, teachers, and students. Personal Computers are easily personalized to suit personal requirements. These Computers are constant companions of those who are on a mission. Minicomputers: Minicomputers are bigger and costlier than Personal Computers. They are faster and their capacity to store information is more as compared to Personal Computers.  Minicomputers are  less powerful than Mainframes. They are smaller and less costly as compared to Mainframes.  Minicomputers are used for medium size demand. They are on duty when the problem is neither too big nor too difficult. Mainframes: Mainframes are big computers. Very powerful and very strong....