Introducing watchOS 10, a milestone update for Apple Watch - Apple

Apple previewed watchOS 10, bringing Apple Watch users redesigned apps, a new Smart Stack to show relevant widgets when needed, and new watch faces.
With the Mindfulness app, users can discreetly and conveniently log their momentary emotions and daily moods.

watchOS 10.1 Coming Later This Month With These 2 New Features - MacRumors

Apple releases watchOS 9.6.1 update for Apple Watch users - 9to5Mac

WatchOS 10: The Best New Features Coming to Your Apple Watch

Introducing watchOS 10, a milestone update for Apple Watch - Apple (GR)

About watchOS 10 Updates - Apple Support

Game Center Overview - Apple Developer

iOS - Wikipedia

iOS - Wikipedia

Apple Watch Series 7 - Apple (BY)

Apple watchOS 10 preview: Plenty of big changes