What is a REGISTRAR?
A REGISTRAR is a company or organization that has been authorized to administer the registration of DOMAIN names.
Regratrars for domain names with the .COM, .NET, & .ORG extensions must be accredited by ICANN (Internet Corporation for Assigned Names and Numbers).
Registrars for country-based domain name extensions are varioiusly accedited on a country-by-country basis.
In the early days of the web, Network Solutions was the sole registrar for the above extensions.