What is Domain Name Registrar?

[grofee]

A domain name registrar is a business that handles the reservation of domain names as well as the assignment of IP addresses for those domain names. Domain names are alphanumeric aliases used to access websites. All domains must be connected to a registrar, and all applications for domain names must be submitted through a registrar. The registrar also helps you with the renewal, transfer or termination of your domain name registration.

[Akshay_M]

You can make up your own domain name just for fun, but if you want it to be connected to the Internet, and findable by other people, you have to sign up through a domain registrar. They are the gatekeepers to online domains.