Starting this fall, the Apple TV app will live on all of your devices — iPhone, iPad, Mac, and, of course, your Apple TV.
That means that rather than renting movies and TV shows through iTunes on your Mac, you'll watch everything through the Apple TV app. Apple says that more than 100,000 iTunes shows and movies will be ported into the Apple TV app, and they'll be available to rent or buy.
The app will include Apple TV channels, so you can stream shows and movies from your favorite channels and services (although that's less necessary on a Mac where you can also just watch them on the channel's website).
On top of that, the app will contain Apple's original streaming service, Apple TV Plus, once it becomes available this fall.
What Apple hasn't clarified yet is whether your previously purchased iTunes movie and TV shows will be routed into the Apple TV app. But given how Apple plans to handle your music library, it'll likely do the same with visual content.