We usually hear that UDP is used with data with which a few packets loss/out-of-order can be tolerated like video streaming. And the instructor typically goes on saying "so if you lose a few datagrames, it'll not affect your video frame".

I've checked major streaming websites like youtube and others. And when I look in Wireshark, I can only see TCP (which is expected as it's a web server). No one is using UDP. I think when it comes to videos, UDP is used for like live conferences or so. But not for video streaming (which is typically hosted on a web server >> http >> TCP).

Could anyone clarify please?

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up vote 4 down vote accepted

You are essentially correct. Mass-market services like YouTube rely on http because everyone uses a web browser to watch them.

If you have a special client, like a conferencing application, then you are more likely to see UDP.

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