Terminology
TLD - top level domain; the domain ending (.com, .xyz, .io, etc)
Domain - the main address for a site (domain.com)
Subdomain - a preface for a domain (subdomain.domain.com)
Registry - a smart contract containing all issued domains
Registrar - a smart contract controlling a domain you can register subdomains in
Root Registrar - a registrar for a TLD
Registrant - the owner of a registration; the user buying a domain
Resolver - a smart contract storing the data for a given domain
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