Every domain that is registered and hosted has a great deal of DNS records - some of them are set up automatically when you host a domain, others can be set up by hand if required. For example, the A record of a domain name is its IP address i.e. this record reveals where the web site is situated; the MX records reveal where the emails are handled, while with an SRV record you can use a domain address for unconventional purposes, including a Voice-over-IP service. The ability to set up and modify certain records enables you to have different services with different companies if, for example, your present host provides dependable web hosting, but has problems with the e-mail service, or you simply prefer to get a particular service from a particular company. Though you can set up and edit these records freely and without any limits as you own a given domain name, lots of companies charge extra to give you this option.