Cyber is a prefex which describes an object, person, or idea as a part of the computer and information age. This prefix has been applied to a number of things, including cybernetics, cyberspace, cyberterrorism, Cyberwarfare, and Cyberpunk.
This prefix was derived from the Greek word "kybernetes," which means "governor" or "steersman." Norbert Wiener (1894-1964) and his colleagues are credited with coining the term for use in the word cybernetics. This was popularized in Wiener's 1948 book, Cybernetics or Control and Communication in the Animal and the Machine.