Two months later, Apple acquired it and integrated it into the iPhone 4S at its release on 4 October 2011, removing the separate app from the iOS App Store. Siri was released as an app for iOS in February 2010. Its original American, British, and Australian voice actors recorded their respective voices around 2005, unaware of the recordings' eventual usage. Its speech recognition engine was provided by Nuance Communications, and it uses advanced machine learning technologies to function. Siri is a spin-off from a project developed by the SRI International Artificial Intelligence Center. With continued use, it adapts to users' individual language usages, searches, and preferences, returning individualized results. It uses voice queries, gesture based control, focus-tracking and a natural-language user interface to answer questions, make recommendations, and perform actions by delegating requests to a set of Internet services. Siri ( / ˈ s iː r i, ˈ s ɪ r i/ SEE-ree, SI-ree) is the digital assistant that is part of Apple Inc.'s iOS, iPadOS, watchOS, macOS, tvOS, audioOS, and visionOS operating systems.

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