Any time you add a domain as hosted in some account, you usually set a pair of Name Servers to point it to that particular provider. On their end, three records are created automatically the moment the domain address is added - one A record and two MX records. The first one is a numeric address, or IP address, which “tells” the Internet domain where its site is, while the other two are alphanumeric and they reveal the server that deals with the emails for that particular domain address. The website and the email hosting are generally considered to be one thing, while they are in reality two different services. Having different records for them will allow you to have them with different providers if you wish. As an illustration, some new company could have superb 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 latter, you will get the best of both providers. These records are checked whenever you want to open a site or send an email - in either case, the provider whose name servers are used for the domain is going to be contacted to retrieve the A and MX records and if you have set records different from their own, the right web/mail server will then be contacted and you'll see the needed site or your e-mail will be delivered.