How do links with "m.somename.com" on mobile, work?

How do links with "m.somename.com" on mobile, work?
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#1

Hi, I’ve seen some sites have a different url when accessed on mobile devices, starting with “m.”, I was just wondering, how is it integrated into the website? Hope this isn’t a dumb question, just curious


#2

It is a sub domain, so most likely they are serving a page or web app different from the normal page.