Basic Information Technology

A disk drive used to read from and write to a hard disk.

A graphics card is a device installed in a computer that consists of a graphics processing unit designed to help process and display images, especially 3D graphics. Graphics cards help take the processing strain off the main processor, and can contain their own memory to take the strain off the system RAM.

A device that scans documents and converts them into digital data.

A power supply unit (PSU) converts mains AC to low-voltage regulated DC power for the internal components of a computer. Modern personal computers universally use a switched-mode power supply. Some power supplies have a manual selector for input voltage, while others automatically adapt to the supply voltage.

A machine for printing text or pictures, especially one linked to a computer.

Daisy wheel printing is an impact printing technology invented in 1969 by David S. Lee at Diablo Data Systems. It uses interchangeable pre-formed type elements, each with typically 96 glyphs, to generate high-quality output comparable to premium typewriters such as the IBM Selectric, but two to three times faster.

A virtual printer is a piece of computer software whose user interface and API resemble that of a printer driver, but which is not connected with a physical computer printer.

A printer linked to a computer producing good-quality printed material by using a laser to form a pattern of electrostatically charged dots on a light-sensitive drum, which attract toner (or dry ink powder). The toner is transferred to a piece of paper and fixed by a heating process.

A dye-sublimation printer (or dye-sub printer) is a computer printer which employs a printing process that uses heat to transfer dye onto materials such as a plastic, card, paper, or fabric.

Dot matrix printing or impact matrix printing is a type of computer printing which uses a print head that moves back and forth, or in an up and down motion, on the page and prints by impact, striking an ink-soaked cloth ribbon against the paper, much like the print mechanism on a typewriter.

A machine that prints output from a computer a line at a time rather than character by character.

A light-emitting diode (LED) is a semiconductor device that emits visible light when an electric current passes through it. The light is not particularly bright, but in most LEDs it is monochromatic, occurring at a single wavelength.

A data cable is any media that allows base-band transmissions (binary 1,0s) from a transmitter to a receiver. Coaxial cable is sometimes used as a base-band digital data cable, such as in serial digital interface and thick-net and thin-net.

DOS (Disk Operating System) was the first widely-installed operating system for personal computers. Earlier, the same name had been used for an IBM operating system for a line of business computers.

One thousand-millionth of a second.

A combined device for modulation and demodulation, for example, between the digital data of a computer and the analogue signal of a telephone line.

A Network interface card, NIC, or Network card is an electronic device that connects a computer to a computer network, usually a LAN. It is considered a piece of computer hardware.

It has scanner to scan the document and also have printer to Print the document.

A Projection panel is a device that, although no longer in production, was used as a data projector is today.

It works with an overhead projector (OHP). The panel consists of a translucent LCD, and a fan to keep it cool. The projection panel sits on the bed of the OHP, and acts like a piece of OHT transparency. The panels have a VGA input, and sometimes Composite (RCA) and S-Video.

Component Object Model (COM) is a binary-interface standard for software components introduced by Microsoft in 1993. It is used to enable inter-process communication and dynamic object creation in a large range of programming languages.