It's your own personal assistant that will (eventually) handle basically any and all tasks/requests you do with devices today (alarms, reminders, directions, messages, emails, fact questions, general questions, etc.).
Off the top of my head I can only think of Notability as something I paid for.
It's your own personal assistant that will (eventually) handle basically any and all tasks/requests you do with devices today (alarms, reminders, directions, messages, emails, fact questions, general questions, etc.).