What is "tvos"

tvOS is an operating system developed by Apple Inc. for the fourth generation Apple TV digital media player. tvOS was announced on September 9, 2015 at the Apple September 2015 event, alongside the 4th generation Apple TV. On October 26, 2015, 4th generation Apple TV pre-orders began, and shipments began the following week. tvOS is available in a beta form. There is only a developer beta though, unlike Apple's other operating systems with a developer beta and a public beta. At the Apple September 2015 Event, Hipster Whale's Andy Sum demoed Crossy Road for the Apple TV, available via the tvOS App Store. Apple also announced that other apps (such as Netflix and HBO Now) would be coming to the Apple TV running tvOS.

tvOS is based on iOS heavily rather than just the stripped-down versions of iOS that the operating systems for the 2nd and 3rd generation Apple TV are. The 4th generation Apple TV, with support for third-party software via an App Store, was rumored prior to the Apple September 2015 Event held on September 9, 2015.