Apple Intelligence makes Siri much more powerful, as it can understand the user given specific contexts, even if they stumble over their words.
Apple has built Siri to be more present throughout the operating system, acting as a true intelligent assistant that understands data from Messages, Mail, Photos, and any system app. For example, make plans by requesting a rescheduled meeting that takes into account data from Calendar, a planned movie date in Messages, and other system information.
The new Siri is built with the same technologies powering Apple Intelligence. It prioritizes privacy even with intimate access to user data, photos, and messages.