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While there are a variety of interface brands, to date, there are two main categories of conversational interfaces; [[voice command device|voice assistants]] and [[chatbot]]s.
== History ==
First voice user interface was "Audrey" by Bell Labs that could understand digits<ref>{{Cite web|url=https://www.infostretch.com/blog/view-from-the-labs-voice-user-interfaces-a-short-history-and-a-bright-future/|title=View from the Labs: Voice User Interfaces – A Short History and a Bright Future {{!}} Digital Transformation, QA & Software Testing Company – Infostretch|language=en-US|access-date=2019-11-22}}</ref>. Another earliest examples of conversational interfaces was an Automated Telephone Service called "''Phone slave''" <ref>{{Citation|last=Love|first=Steve|title=5 - Design issues for mobile systems|date=2005-01-01|url=http://www.sciencedirect.com/science/article/pii/B9780750663526500062|work=Understanding Mobile Human-Computer Interaction|volume=|pages=86|editor-last=Love|editor-first=Steve|series=Information Systems Series|publisher=Butterworth-Heinemann|isbn=978-0-7506-6352-6|access-date=2019-11-22}}</ref>. This answering machine service played messages back to the user. It asked users questions such as “''Who’s calling please''?”, ''“What’s this is in reference to?”''. The caller’s responses were stored, then users could retrieve these answers for each caller. First voice assistant for cars was an accessory developed by OKI telecom to make a phone call<ref>{{Cite web|url=https://nextconf.eu/2012/07/reimund-schmald-voice-user-interface-history-status-future/|title=Reimund Schmald - Voice User Interface: History, Status, Future|date=2012-07-03|website=NEXT Conference|access-date=2019-11-22}}</ref>.
==Voice assistants==
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