Whenever you add a domain name as hosted in some account, you typically set a pair of Name Servers to direct it to that particular service provider. On their end, three records are created automatically right after the domain is added - one A record and two MX records. The former is a numeric address, or IP address, that “tells” the Internet domain where its website is, while the other two are alphanumeric and they reveal the server that manages the e-mails for that particular domain name. The website and the e-mail hosting are often considered to be one thing, when they are in fact two different services. Having separate records for them will enable you to have them with different companies if you want. As an illustration, some new company could have fantastic uptime for your site, but you may not want to switch your e-mail messages from your current host and by employing an A record to point the domain address to the former and MX records to have the e-mails with the second, you can get the best of both companies. These records are checked when you want to open a site or send an e-mail - in either case, the provider whose name servers are used for the Internet domain is going to be contacted to retrieve the A and MX records and if you have set records different from their own, the correct web/mail server will then be contacted and you will see the needed site or your e-mail will be delivered.