You can easily send your Mac screen to your Apple TV and either mirror it or use it as a second display. So, if you want to show something you have on your iPhone or iPad up on your Apple TV, this is just as simple.
You can use AirPlay if you have a video on your iPhone you want to show everyone in the room. And if you want to see a bigger picture of something on your device and interact with it, you can use Screen Mirroring.
Here’s how to both AirPlay and mirror your iPhone or iPad display to Apple TV.