How does YouTube smooth out movie footage?

I've produced a number of movies shot with camcorders and other cameras and the result at times has been shaky footage which does spoil them especially when viewed on a large screen TV.
The same movies sent to YouTube after they've enhanced the footage by steadying it are vastly improved and I've always wondered what technology they use to achieve this.
iMovie's offering doesn't seem to be as effective.
Does anyone have any suggestions how their technology works or can tell me if there's apps about that can remove judder effectively?
Many thanks,
TonyT

That guy is, for my stadards, a bit ... over-excited .. but explains it very well, for ordinary people like me:
https://youtu.be/BgAdeuxkUyY
YouTube itself published - while ago - a video, very impressive, which demoes those 'virtual camera'-thingie that Tom mentions in his report ... can not find it anymore (frankly: my bookmarks are a mess!!), it was a walk thru some garden/restaurant, stairs up, stairs down, handheld, and after stabilzatiion smooth like silk.
Asks for incredible computation power... but, if Youtube has anything, than it's that! ...
btw: I know people, uploading their shaky stuff to YT, let it stabilize, and download it again for further editing .... .
Pros do recommend a plug-in (for FCPX), named Lock&Load ... I'm relying on my cams stabilizer, which does some marvel.
And my rock-solid tripod!

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