All the New Privacy and Security Features Coming to iOS and macOS
Briefly

The iOS 15 update for your iPhone and macOS 12 Monterey update for your Mac will arrive later in the year, along with improvements designed to keep your data and your devices safe from harm.
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Marketers, newsletter writers, and plenty of people in between use these tracking pixels to see how many people open their messages, but Mail Privacy Protection stops this data gathering.It won't be turned on by default, but it will be highlighted as an option when you upgrade to iOS 15 and macOS 12 Monterey.
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As for Apple's digital assistant, Siri, more of the speech recognition work and command processing is going to be done on your specific device.This reduces the amount of data sent back to Apple and stored in the cloud, and meaning it's less likely that somebody else could be listening in, even if all you mostly do is check the weather, set alarms, and add items to your to-do list.
Read at Wired
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