Having total control over your domain names is something very necessary and being able to access and edit the DNS records for each of them is one of the things you should look for when you search for a registration or a shared website hosting provider. You might have heard about the so-called “name servers” that show where a domain address is hosted, but below them there's a whole list of records, like the A record, which is the IP address of the server hosting the website, and the MX records, which show the server that manages the e-mails for a specific domain address. These records are used if you would like have your web site with one provider and the e-mails with another, for instance. You could also use a domain for a non-website service or direct the traffic to it using special records. Some companies ask for an extra payment to grant access to edit certain DNS records other than the name servers.