What is ytimg.com?

There is a place on my site that when something is loading makes a call of some kind to a domain called 1l.ytimg.com.

I can see this in the status bar …“transferring from 1l.ytimg.com

However when I look at the code I do not see a reference to this.

Any ideas what this is?

When I go the site it appears to be one of those site that just displays pay per click ads.

Thank you.


CDN for YouTube. It serves YouTube thumbnails and possibly more.