Any active domain name that is added in a hosting account has a variety of records that enable it to function properly. In the standard case, the name servers (NS records) show where the Internet domain is hosted and they are set on the side of the registrar company, but on the lower level there are specific records set 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 such as Voice-over-IP), etc. Having access to these records and by having the ability to edit them, you could have your web site with company A and your e-mail messages with company B, for illustration. This gives you more overall flexibility as you can choose the best provider for each of these services and you do not have to stick with a single company. As soon as you choose a hosting company, you have to make sure that you have access to all DNS records freely because some companies have an additional fee for this function.