Every domain that is registered and hosted has quite a lot of DNS records - some of them are created automatically when you host a domain, others can be created manually if required. For example, the A record of a domain name is its IP address i.e. this record shows where the website is situated; the MX records show where the e-mails are handled, while through an SRV record you can use a domain address for unconventional purposes, such as a Voice-over-IP service. Being able to set up and modify particular records enables you to have different services with different providers if, for instance, your present host provides dependable web hosting, but has problems with the email service, or you simply prefer to get a particular service from a specific company. Although you must be able to set up and modify these records freely and with no limitations as you own a given domain, some companies charge extra to give you this option.