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{{short description|Information retrieval service and legacy system}} {{Infobox online service | name = Viewdata | title = Viewdata | logo = | logo_size = | logo_alt = | logo caption = | image = File:viewdata Graphics 1.jpg | image_size = 200px | image_alt = | caption = Viewdata Graphics used in the experimental phone directory of [[Post Office Telecommunications]] in 1977. <br />The image is a graphical representation of the Post Office/[[British Telecom]] Research laboratories ([[Adastral Park]]) in [[Suffolk]], England. Note the "_ to continue" rather than the correct "β to continue", showing a common rendering error. | developer = [[Samuel Fedida]], [[General Post Office|Post Office]] | generation = | type = [[Videotex]] | launched = {{Start date and age|1974}} | discontinued = | version = | version release date = | preview version = | preview version release date = | updated = | platform = Viewdata | operating system = | status = | members = | website = }} [[File:Teletext Viewdata Terminal.png|thumb|right|300px|A Viewdata machine displayed in [[teletext]] format]] '''Viewdata''' is a [[Videotex]] implementation. It is a type of [[information retrieval]] service in which a [[subscriber]] can [[Access control|access]] a remote [[database]] via a [[common carrier]] [[Communication channel|channel]], request [[data]] and receive requested data on a [[video]] display over a separate channel. [[Samuel Fedida]], who had the idea for Viewdata in 1968, was credited as inventor of the system which was developed while working for the British [[General Post Office|Post Office]] which was the operator of the national telephone system. The first prototype became operational in 1974. The access, request and reception are usually via common carrier broadcast channels. This is in contrast with [[teletext]].
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