What is the name of Apple's voice assistant introduced with the iPhone 4S? It is Siri. Apple integrated Siri into the iPhone 4S at its release in October 2011, making spoken requests a prominent part of the phone's public identity.
Siri could recognize natural-language questions and commands, then respond using information and actions connected to the iPhone. Users could ask about weather, appointments, messages, directions, and other everyday tasks. At launch, Siri was presented as a beta feature rather than a fully mature service.
The iPhone 4S was not Siri's first appearance anywhere: Siri had previously existed as a standalone iOS application. Apple acquired the technology and incorporated it into the iPhone 4S, after which the separate app was removed from the App Store. This history is why the assistant is associated with the 4S even though its underlying project began earlier.
Siri is often mixed up with Amazon Alexa, Microsoft's Cortana, and Google Assistant. Those are rival voice-assistant products; Siri is Apple's assistant and later expanded to devices such as iPads, Macs, Apple Watch, Apple TV, and HomePod.