Having 100 % control over your domains is something quite important and to be able to access and edit the DNS records for every single one of them is one of the things you have to look for when you search for a registration or a website hosting provider. You might have heard of the so-called “name servers” that show where a domain is hosted, but below them there's a whole set of records, for example the A record, which is the IP address of the server hosting the website, and the MX records, which show the server that handles the e-mails for a certain domain address. These records are employed if you want to have your website with one service provider and the e-mails with another, for example. You could also use a domain address for a non-website service or forward the traffic to it by using special records. Many companies ask for an extra payment to provide access to edit particular DNS records besides the name servers.