Why does YouTube not show my iframe in a frame?

Refused to display ’ https://www.youtube.com/ ’ in a frame because it set ‘X-Frame-Options’ to ‘sameorigin’. This is because the site you are trying to access limits embedding (via iframe, frame, embed, object) to the same origin using the X-Frame-Options header. So youtube.com can load iframes with youtube.com pages just fine, but nobody else can.
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