
watchOS is the operating system that runs on the Apple Watch, powering its fitness tracking capabilities, apps, communication features, time-keeping abilities, and more. Apple plans to push regular updates to fix watchOS bugs, refine performance, and introduce new features, and the release of watchOS 2 alongside iOS 9 later today is a major uprade for the platform. (Update: Apple has delayed the public release of watchOS 2.)

watchOS updates are installed in a unique way that differs from how we install iPhone and Mac updates, so we've crafted a quick tutorial to remind users how to get the latest version of watchOS on their Apple Watches so they're ready for watchOS 2.
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Article Link: How to Update Apple Watch's watchOS Software