update, an improvement or a fix for software, bug, an error in a computer program, data, information that is stored on a computer, backup, a copy of a file that can be used if the original is lost or damaged, virus, a small program designed to spread from one computer to another and destroy the drive, spyware, a software program that can collect secret information like usernames and passwords, Trojan, a software program that seems to be helpful but that is, in fact, designed to destroy data, firewall, a system that prevents unauthorized users gaining access to a private computer network, cookie, data sent to a computer by a web server that records a user's actions on a certain website, spam, advertising material sent by email to people who have not asked for it.

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