Any active domain name that is added in a hosting account includes a variety of records that permit it to function properly. In the common case, the name servers (NS records) show the location 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 a domain address for non-website purposes on a certain port number such as Voice-over-IP), and many others. By having access to these records and by having the capacity to modify them, you may have your website with company A and your emails with company B, for illustration. This gives you more flexibility because you can choose the best provider for every one of these services and you do not have to stick to one company. After you select a hosting company, you have to make certain that you have access to all DNS records freely as some providers have an extra fee for this function.