Technology is getting advance day-by-day and gadgets from same OEMs are now being connected in many ways to content their users. In the past, we had two or three options to watch the media from our Mobile or Camera through the AV cable, later arrived the HDMI cable to connect to PC, now since then they are using the same OS for both the Smart TVs and Smartphones. Well, most of the OEMs like Sony and Samsung are using Android in their TVs, connecting your Smartphone with the TV to watch all the Media of your device.
One-Touch Mirroring, allows you to connect your device with the TV to use it as mirror and watch all the things, this concept is out for a while but if you happen to own a BRAVIA TV and Sony Xperia Z2, along with a TV Remote control with NFC connectivity, all you need to do is to Tap your device with the remote to use your TV as a mirror to view your device, you can even use it as a Viewfinder for the Camera app.
Here is a Video to demonstrate how and what actually happens: