Having total control of your domain names is something quite necessary and to be able to access and edit the DNS records for any of them is among the things you have to look for when you search for a registration or a shared web hosting provider. You may have heard about the so-called “name servers” that show where a domain name is hosted, but below them there is a whole list of records, for example the A record, which is the IP address of the server hosting the site, and the MX records, which show the server that deals with the emails for a specific domain address. These records are employed if you'd like to have your site with one company and the e-mails with another, for example. You could also use a domain for a non-website service or forward the traffic to it through special records. A lot of companies ask for an additional payment to grant access to edit certain DNS records apart from the name servers.