A preset word or phrase that starts a voice assistant listening.
It is like calling your dog’s name. Say “Hey Siri,” and the little robot ears pop up.
It lets voice helpers wait quietly until needed. You hear it on phones and smart speakers.
ASR
After the wake word, ASR turns your speech into text.
Conversational interface
It starts a voice chat without bothering you first.
AI Smart Home
Smart speakers use it to wait for your command.