Whenever you add a domain name as hosted in some account, you normally set a pair of Name Servers to point it to that specific company. On their end, three records are set up automatically the moment the domain name is added - one A record and two MX records. The first one is a numeric address, or IP address, which “tells” the domain name where its site is, while the other two are alphanumeric and they indicate the server that handles the emails for that specific domain name. The website and the email hosting are usually considered to be one thing, when they are in reality two different services. Having separate records for them will permit you to have them with different providers if you want. As an illustration, some new service provider can have fantastic uptime for your website, but you might not want to switch your e-mails from your current host and by employing an A record to point the domain to the former and MX records to have the e-mails with the second, you will get the best of both providers. These records are checked when you wish to open a website or send an e-mail - in either case, the provider whose name servers are used for the domain name 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'll see the needed site or your email will be delivered.