A monitor or display (sometimes called a visual display unit) is an electronic visual display for computers. The monitor comprises the display device, circury, and an enclosure. The display device in modern monitors is typically a thin film transistor liquid crystal display (TFT-LCD), while older monitors use a calothe ray tube (CRT). Is an output divice

http://en.wikipedia.org/wiki/Computer_monitor

The keyboard is the element of the computer in wich we tip leteres onto the computer. Is an input device

The mouse is the indicator wich we move in order to work. Is an input divice

Computer speakers, or multimedia speakers, are speakers external to a computer, that disable the lower fidelity built-

in speaker. They often have a low-power internal amplifier.Is an output divece.

http://en.wikipedia.org/wiki/Computer_speaker

Random access memory (RAM) is the best known form of computer mamory. RAM is considered "random access" because you can access any memory cell directly if you know the row and column that intersect at that cell.

http://www.howstuffworks.com/ram.htm

Read-only memory (ROM), also known as firmware, is an integrated circuit programmed with specific data when it is manufactured. ROM chips are used not only in computer, but in most other electronic items as

well.

http://computer.howstuffworks.com/rom.htm

In a condenser mike, also called an "electrostatic mike" or "capacitor mike," the diaphragm changes the capacitance between itself and a metal plate, both acting as electrodes. The widely used electret mike has a charged dielectric between the electrodes that generates voltage.Is an input divice.

http://www.yourdictionary.com/computer/microphone

Head-mounted speakers. Headphones have a strap that rests on top of the head, positioning a pair of speakers over both ears. For listening to music or monitoring live performances and audio tracks, both left and right channels are required. When used with the telephone, a microphone is attached, and only one speaker is required is an output divice

http://www.yourdictionary.com/computer/headphones

A printer is a piece of hardware for a computer. It is a device that must be connected to a computer which allows a user to print items on paper, such as letters and pictures. It can also work with digital cameras to print directly without the use of a computer.

http://simple.wikipedia.org/wiki/Computer_printer

Uses rules to scan for vulnerabilities on the network, computer system, application program, or Web-based service, typically working with a list of known vulnerabilities. Some Web-application scanners scan for vulnerabilities within applications.

http://www.yourdictionary.com/computer/scanner