Every domain name that is registered and hosted has a great deal of DNS records - some of them are created automatically when you host a domain, others can be set up manually if required. As an example, the A record of a domain is its IP address i.e. this record shows where the site is situated; the MX records reveal where the e-mails are handled, while through an SRV record you can use a domain name for unconventional purposes, including a Voice-over-IP service. The ability to create and modify particular records enables you to have different services with different companies if, for instance, your current host provides good web hosting, but has issues with the e-mail service, or you simply prefer to get a particular service from a specific company. While you must be able to set up and edit these records freely and without any restrictions as you own a given domain address, some companies charge extra to give you this option.