Domain Name Registrar Vs. This is the easiest one to explain. It should be noted that a key difference between registering a domain and buying a car is that cars can be owned by consumers domain names can technically only be leased.
Lets start with the bare bones. This company that holds the domain is called the Registrar. There are many registrars out there Namecheap Network Solutions etc.
There are DNS hosting providers that offer domain registration and vice versa but the two services should not be confused.
When you pay for web hosting you are buying space on a server in a data center with a connection to. Namecheaps excellent website allows searching for individual domains. If you want to extend your registration its easy to renew your domain with GoDaddy. Domains must be registered with a company that holds the domain ownership and domain information WHOIS.