Top Level Domains (TLD) are like private clubs, some with very strict rules on who can be a member – .gov, .mil – and some pretty chill about who can join – .com, .net. The Domain Naming Servers (DNS) don’t care what the TLD is as long as they know how to get the mapping to the IP address.
As a website builder it is your choice which club you want to be member of, buy the ‘membership’ from the club owners (domain registrars or resellers), and then update the DNS config to point to your website.
.com historically represented ‘commercial’ but now is available more generally to everyone.
https://en.m.wikipedia.org/wiki/List_of_Internet_top-level_domains
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