This description covers the launch of the Apple WatchOS service in 2015. It will discuss the features of the service, the benefits to users, and the impact it had on the tech industry. The Apple WatchOS service was released in 2015 as a way to extend the capabilities of the Apple Watch
From Wikipedia
watchOS is the operating system of the Apple Watch, created and developed by Apple. It is based on iOS, the operating system used by the iPhone, and has many similar features. Its original version was released on April 24, 2015, along with the Apple Watch, the only device that runs watchOS. watchOS exposes an API called WatchKit for developer use.