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registrar vs. host
What's the difference between a domain registrar and a web hosting company?
Domain registration is the process by which a company or individual can secure a website domain. When you go to register a domain you are registering the rights to use that specific domain name. Your host is the actual site which holds your site. When you register a domain you can forward it to a host and then list the site.
Domain name registrar - Wikipedia, the free encyclopedia
Web hosting service - Wikipedia, the free encyclopedia