It's programming code that YOU can use, even if you don't really understand it all.
Question: How do I 'embed' one of my favorite videos (from YouTube) in my wiki-page here?
Answer: Go copy the 'embed' code that YouTube shows you right beside your favorite video... and come back here to your wiki-page, EDIT-page, and INSERT PLUGIN, google-gadget, paste the embed-code, and hit OK. Save. Done.
Example...
Now YOU try it... go ahead, try it right here in this page if you like...