Any active domain name that's added in a hosting account features a variety of records that enable it to perform properly. In the general case, the name servers (NS records) show the location where the domain is hosted and they are set on the side of the registrar company, but on the lower level there are specific records created through the hosting company such as A (IP address of the website/server), MX (e mail server), SRV (employing an Internet domain for non-website purposes on a specific port number like Voice-over-IP), and so on. Having access to these records and by being in a position to edit them, you can have your site with company A and your e-mail messages with company B, for instance. This offers you more freedom as you can select the best provider for every single one of these services and you do not have to stick with one company. After you pick a hosting company, you have to make sure that you have access to all DNS records freely since some companies have an additional fee for this feature.