How do I use AirPlay to stream from a Mac to an Apple TV?

To use AirPlay to stream from your Mac to an Apple TV, ensure that both devices are connected to the same Wi-Fi network. On your Mac, click on the AirPlay icon in the menu bar at the top of the screen, which looks like a rectangle with a triangle at the bottom. If the icon is not visible, go to System Preferences, then Displays, and check the box for "Show mirroring options in the menu bar when available." Once you've clicked the AirPlay icon, select your Apple TV from the list of available devices. If it's your first time connecting to this Apple TV, you might need to enter a code that appears on your TV screen. Your Mac's screen should now be mirrored on your TV. You can also choose to use the TV as a separate display from the same menu depending on your preference or extend your desktop for more screen space. When finished, click the AirPlay icon again and select "Turn AirPlay Off" to disconnect.