Mirror your Mac or iPhone to the TV
With the Apple TV hooked up to your TV it is easy to connect your Mac to your TV, your iPhone to your TV or an iPad to it.
You can use AirPlay Mirroring to stream your screen to the Apple TV. This lets you sit on the couch with your iPhone or Mac and see your content on the big screen.
You need to be on the same WIFi network and then you can choose AirPlay Mirroring on iPhone, iPad or Mac and then your screen will appear on the TV.
On Mac there is a small AirPlay logo in the menu bar and on the iPhone the option is in the Control Center.