Connect iPad Pro (iOS 11.2.1) to Apple TV or TV

How do I Connect iPad Pro (iOS 11.2.1) to Apple TV - or maybe just TV.

Quite by accident I somehow connected my iPad Pro to Apple TV (?) which turned on and duplicated video on iPad. I was viewing a YouTube video and pressed something (?) which started the TV display. All this is wireless.

Not sure if I was connected to Apple TV, as indicator led was not on.

I only use Apple TV for MLB Games, and don’t understand how this connection was made. HDMI cables used for Apple TV connections. I did notice a new TV menu item, while video running, but failed to copy name.
MARSPATHRetired EE/Computers/ITAsked:
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You have probably turned on AirPlay:

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Tom CieslikIT EngineerCommented:
Jackie ManIT ManagerCommented:
What is the brand and model of your TV?

Is the TV connected to your router via wireless or network cable?

Have you clicked "Send to TV" button in YouTube app?
MARSPATHRetired EE/Computers/ITAuthor Commented:
Thanks to all for your support.
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