add-in board A device that plugs in to a desktop computer’s system unit and provides auxiliary functions. (Also called a card.)

address The location of an Internet host. An email address might take the form; a web address might look like See also URL.

all-in-one computer A desktop computer where the system unit, monitor, and speakers are housed in a single unit. Often the monitor of such a system has s touchscreen display.

app See application.

application A computer program designed for a specific task or use, such as word processing, accounting, or missile guidance.

attachment A file, such as a Word document or graphics image, attached to an email message.


backup A copy of important data files.

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