Any active domain that is added in a hosting account has a variety of records that permit it to work 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 particular records set through the hosting company like 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), and so on. Having access to these records and by having the capacity to edit them, you may have your site with company A and your e-mails with company B, for illustration. This gives you more flexibility since you can select the best provider for every single one of these services and you don't have to stick to one company. Whenever you choose a hosting company, you have to make certain that you can access all DNS records freely since some providers have an additional fee for this feature.