Every registered domain name has a minimum of 2 Name Server records that show where it is hosted i.e. by using these records you point your domain to the servers of a specific web hosting company. This way, you have got both your website and your e-mails managed by the exact same provider. On the lower level of the Domain Name System (DNS), nevertheless, there is a variety of other records, such as A and MX. The former shows which server manages the website for a given domain address and is always an IP address (188.8.131.52), while the second one indicates which server manages the e-mails and is always an alphanumeric string (mx1.domain.com). As an example, when you enter a domain name in your web browser, your request is directed through the global DNS system to the provider whose NS records the domain address uses and from there you will be forwarded to the servers of a different service provider in case you have set an IP address of the latter as an A record for your Internet domain. Having different records for the site and the emails means you can have your site and your emails with two different companies if you would like.