Computer is one of the greatest invention of modern science. It is a device that works like a human brain. That is why, it is called the ‘electric brain’. It stores information, analyses it and produces information as required from the data. There are five major components in a computer. They are the input unit, the output unit, the memory unit, the control unit and the arithmetic unit. A computer can be opened, operated and shut down with the help of a mouse. All complicated tasks can be done easily in a very short timewith the help of a computer. The internet is a computer-based communication system. The internet has become very popular worldwide as it provides information, communication and recreation instantly. Computer is immensely beneficial though it has some demerits too. It becomes an addiction to some users. Many prefer spending more time with a computer to doing outdoor activities. But in the age of globalization we cannot do without a computer.
A computer is a device that accepts information (in the form of digitalized data) and manipulates it for some result based on a program or sequence of instructions on how the data is to be processed. Complex computers also include the means for storing data (including the program, which is also a form of data) for some necessary duration. A program may be invariable and built into the computer (and called logic circuitry as it is on microprocessors) or different programs may be provided to the computer (loaded into its storage and then started by an administrator or user). Today's computers have both kinds of programming. Most histories of the modern computer begin with the Analytical Engine envisioned by Charles Babbage following the mathematical ideas of George Boole, the mathematician who first stated the principles of logic inherent in today's digital computer. Babbage's assistant and collaborator, Ada Lovelace, is said to have introduced the ideas of program loops and subroutines and is sometimes considered the first programmer. Apart from mechanical calculators, the first really useable computers began with the vacuum tube, accelerated with the invention of the transistor, which then became embedded in large numbers in integrated circuits, ultimately making possible the relatively low-cost personal computer.