Every registered domain has a minimum of two Name Server records that show where it is hosted i.e. by using these records you point your Internet domain to the servers of a certain web hosting company. This way, you have both your website and your e-mails handled by the very same company. On the lower level of the Domain Name System (DNS), nevertheless, there are a number of other records, like A and MX. The first one reveals which server handles the website for a given Internet domain and is always an IP address (188.8.131.52), while the latter shows which server handles the e-mails and is always an alphanumeric string (mx1.domain.com). As an illustration, any time you enter a domain address in your web browser, your request is directed through the global DNS system to the company whose NS records the domain name uses and from there you may be sent to the servers of another provider if you have set an IP address of the latter as an A record for your Internet domain. Having independent records for the site and the e-mails suggests that you can have your site and your emails with two different providers if you wish.