I was a touch surprised to see this question 'what does a domain registrar do' was closed as off topic, its a little confused but it's basically asking how DNS works and what a registrars role in that process is.
On its face that would appear to be exactly our wheelhouse, if it isn't whose is it?
"How the Internet works" does not fall under "the operation of websites which you control" as stated in the faq. If the question related to a DNS problem or domain problem they were having it would be a different story.
Seems closer to "not a real question" on the basis that it is apparent that the asker knew the right terminology and claimed some knowledge of the domain name system - but did not consult Google/Wikipedia about the fundamentals.