eli5: How does siri hear me say “hey siri” if it isn’t constantly listening to my conversations or me speaking?

Question

eli5: How does siri hear me say “hey siri” if it isn’t constantly listening to my conversations or me speaking?

In: 17336

Answer 1

Because it is always listening. The data just isn’t recorded or stored in any way, or searched, so they can claim the microphone isn’t listening when, obviously, it has to be for the service to work. Same with Alexa and Google Home