The Siri app lets you access all your past Siri conversations (unless you turn that feature off) and pick up an old conversation right where you left off. Conversation history syncs privately through iCloud, so you can start an exchange on your iPhone and continue it later from your wrist. You can also pin a conversation you expect to revisit.
You can also use Siri on the Apple Watch to ask questions, launch apps, or even get more complex responses, such as step counts on a specific day. It can also answer difficult and specific queries with detailed answers and can summon real-time information from the web.
Personal context is the real story
That’s key, of course, as it means the smartwatch on your wrist can help you access specific details from all your contextual information; it can get details from messages, emails, and notes, for instance. Or you might use it to find a number and call it, access your door code, or look up customer information for business — all without touching your phone.