You may have come across these very similar terms and have been a little confused as to their meanings; hopefully this will help clarify them.
Once you have decided on the domain name you want for you website you must then go through the process of registration. This is simply the process of claiming a particular domain name as your own. Once you have registered a domain name you become the registrant of that domain.
In order to register your domain you must go to a registrar. The registrar is a company that has the capability to register your domain on your behalf. iDAQ is an example of a registrar that offers very competitive rates for domain registration.
When we at iDAQ register your domain, we do so by updating a database called the registry. The registry holds information about every domain name that has been registered.
Register your domains here https://portal.idaq.com/checkdomain/domains/.