A domain name registrar is a company that manages the reservation of internet domain names. Here are some of the main domain name registrars and how they work:

1. GoDaddy: GoDaddy is one of the largest domain name registrars in the world. It allows individuals and businesses to register and manage their domain names. Customers can search for available domain names and register them for a specified period of time, typically one or more years.
2. Namecheap: Namecheap is a popular domain name registrar that offers a variety of domain name services, including domain registration, domain transfer, and domain renewal. Customers can search for available domain names, register them, and manage their domains through the Namecheap website.
3. Network Solutions: Network Solutions is one of the oldest domain name registrars, having been in business since 1979. It offers a range of domain name services, including domain registration, domain transfer, and domain renewal. Customers can search for available domain names, register them, and manage their domains through the Network Solutions website.
4. Enom: Enom is a domain name registrar that offers a variety of domain name services, including domain registration, domain transfer, and domain renewal. Customers can search for available domain names, register them, and manage their domains through the Enom website.
5. 1&1: 1&1 is a multinational domain name registrar that offers a variety of domain name services, including domain registration, domain transfer, and domain renewal. Customers can search for available domain names, register them, and manage their domains through the 1&1 website.

These domain name registrars work by offering a platform for customers to search for and register domain names. Customers can typically search for available domain names, purchase the rights to a specific domain name for a specified period of time, and manage their domains through the registrar’s website. The domain name registrar is responsible for maintaining a database of all registered domains and ensuring that the domain names are properly registered and maintained.