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What is a keylogger?

A keylogger is a computer program that logs each keystroke a user types on a keyboard and saves this data into a file or transfers it via the Internet to a pre-determined remote host. It also can capture screenshots of the user activity, log-in passwords, record online chat conversations or take different actions in order to find out what a user is doing. Often downloaded inadvertently by users clicking on links in fraudulent e-mails, keyloggers pose the most dangerous threat to user privacy.