<Tr> <Th_colspan="2"> Support status </Th> </Tr> <Tr> <Td_colspan="2"> Supported </Td> </Tr> <P> Siri (pronounced / ˈsɪəri /) is an intelligent personal assistant, part of Apple Inc.'s iOS, watchOS, macOS, and tvOS operating systems . The assistant uses voice queries and a natural language user interface to answer questions, make recommendations, and perform actions by delegating requests to a set of Internet services . The software adapts to users' individual language usages, searches, and preferences, with continuing use . Returned results are individualized . </P> <P> Siri is a spin - off from a project originally developed by the SRI International Artificial Intelligence Center . Its speech recognition engine is provided by Nuance Communications, and Siri uses advanced machine learning technologies to function . Its original American, British, and Australian voice actors recorded their respective voices around 2005, unaware of the recordings' eventual usage in Siri . The voice assistant was released as an app for iOS in February 2010, and it was acquired by Apple two months later . Siri was then integrated into iPhone 4S at its release in October 2011 . At that time, the separate app was also removed from the iOS App Store . Siri has become an integral part of Apple's products, having been adapted into other hardware devices over the years, including newer iPhone models, as well as iPad, iPod Touch, Mac, and Apple TV . </P>

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