is a term popularized by author William Gibson in the year 1984, in his novel Neuromancer, in which humans “jacked” or projected their disembodied consciousness into Earth’s computer “matrix” and then roamed wherever they pleased. Cyberspace exists only as digital bits stored and traveling on a computer network. The term borrows from the word cybernetics, coined by mathematician Norbert Weiner in 1948. Cybernetics is the discipline that compares electronics control systems to the human nervous system.
The closest thing we have to the true cyberspace today is Internet, but the term has also been appropriated to refer to the realm inhabited by more prosaic online services. If your email messages take a long time getting to their destination, they must be stuck in cyberspace.
William Gibson (Wikipedia)
Norbert Weiner (Wikipedia)