Apple Watches offer loads of features including workout-tracking, health monitoring, calling and texting, handling notifications from your phone, setting alarms, stream music to headphones, check maps, monitor your sleep, contact the Siri AI assistant and more.
Plus, thanks to the watchOS App Store, you can download third-party apps to get extra features and tools.
Each newer generation of Apple Watch comes with newer features too, so definitely check out the review of the handset you're interested in to make sure it does what you need it to.