An acronym (from Greek: -acro = sharp, pointed; -onym = name) in its pure form denotes a combination of letters (usually from an abbreviation) which can be used and pronounced as a word. For the sake of clarity and readability, this definition is not always followed within the 2 lists on this page.
A method of displaying unwanted, unsolicited advertising on your computer. It usually is in the form of malicious code.
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Short for application, an "app" is a program designed to operate within a mobile system. They can be considered "add-ons" for mobile devices like smartphones and tablets. Two of the most popular operating systems, Apple's iOS and Google's Android, have an increasingly sizable roster of free and paid apps available to users.