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**__Hardware__** :  the mechanical, magnetic, electronic, and electrical components making up a computer system


 * __software:__** Encoded computer instructions, usually modifiable (unless stored in some form of unalterable memory such as ROM). Compare hardware


 * __personal computer:__** A personal computer (PC) is a computer whose original sales price, size, and capabilities make it useful for individuals, and which is intended to be operated directly by an end user, with no intervening computer operator

**__input device:__**  data input device: a device that can be used to insert data into a computer or other computational device


 * __output device:__** An output device is any piece of computer hardware equipment used to communicate the results of data processing carried out by an information processing system (such as a computer) to the outside world.


 * __network:__** Two or more computers connected together using a telecommunication system for the purpose of communicating and sharing resources.


 * __ergonomics:__** The science of the design of equipment, especially so as to reduce operator fatigue, discomfort and injury


 * __virus:__** software program capable of reproducing itself and usually capable of causing great harm to files or other programs on the same computer; "a true virus cannot spread to another computer without human assistance

**__spyware:__**  programs that surreptitiously monitor and report the actions of a computer user


 * __email:__** electronic mail: (computer science) a system of world-wide electronic communication in which a computer user can compose a message at one terminal that can be regenerated at the recipient's terminal when the recipient logs in; "you cannot send packages by electronic mail"


 * __spam:__** E-mail spam, also known as "bulk e-mail" or "junk e-mail," is a subset of spam that involves nearly identical messages sent to numerous recipients by e-mail. A common synonym for spam is unsolicited bulk e-mail

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