A registrar is a sales point for domain names. A registrar can be a company or an organization that registers the domain with a registry.
The registry manages a central database for an address zone. The registrar usually works on behalf of the customer. The registry for the Top Level Domain( TLD) *.de is DeNIC.
In addition, the term registrar is also used for servers that accept a register request. The registrar provides location services together with a proxy or a redirect server.