Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Videotex (or "interactive videotex") was one of the earliest implementations of an "end-user information system". From the late 1970s to mid-1980s, it was used to deliver information (usually pages of text) to a user in computer-like format, typically to be displayed on a television. In a strict definition, videotex refers to systems that provide interactive content and display it on a television, typically using modems to send data in both directions. A close relative is teletext, which sends data in one direction only, typically encoded in a television signal. Sometimes the term "viewdata" is used to describe all such systems generically. Unlike the modern Internet, traditional videotex services were highly centralized.

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