What is Internet | AZEEM KHAN

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  Printers:    Printer  are Output devices used to prepare permanent Output devices on paper.  Printers can be divided into two main categories: Impact Printers : Impact Printer In this hammers or pins strike against a ribbon and paper to print the text. This mechanism is known as electro-mechanical mechanism. Non-Impact Printers  : There printers use non-Impact technology such as ink-jet or laser technology. There printers provide better quality of O/P at higher speed.  Impact Printer Two Types: Character Printer : It prints only one character at a time. It has relatively slower speed. Eg. Of them are Dot matrix Printer. Laser Printer: Laser Printer is a type of printer that utilizes a laser beam to produce an image on a drum. The light of the laser alters the electrical charge on the drum wherever it hits. The drum is then rolled through a reservoir of toner, which is picked up by the charged portions of the drum. Finally, the toner is transferred to...
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Computer Information

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  What is Computer? A  computer  is an electronic device that manipulates information, or data. It has the ability to  store ,  retrieve , and  process  data. You may already know that you can use a computer to  type documents ,  send email ,  play games , and  browse the Web . You can also use it to edit or create  spreadsheets ,  presentations , and even  videos.
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First Generation Computer: The period of first generation: 1946-1959. Vacuum tube based. Second Generation Computer: The period of second generation: 1959-1965. Transistor based. Third Generation Computer: The period of third generation: 1965-1971. Integrated Circuit based. Fourth Generation Computer: The period of fourth generation: 1971-1980. VLSI microprocessor based. Fifth Generation Computer: The period of fifth generation: 1980-onwards. ULSI microprocessor based.
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