Voice assistant

Voice assistant is an AI-powered software agent: it uses Automatic Speech Recognition (ASR) and Natural Language Processing (NLP) to execute user commands via spoken language.

This technology delivers hands-free task execution across multiple devices (smart speakers, smartphones, vehicles). Core functionality relies on a three-step process: ASR converts speech to text, NLP interprets intent, and Text-to-Speech (TTS) provides the synthesized response. Major commercial examples include Apple Siri, Amazon Alexa, and Google Assistant, which collectively manage billions of user requests daily, from setting a 07:00 alarm to controlling smart home devices (IoT).

https://en.wikipedia.org/wiki/Virtual_assistant