Every domain that is registered and hosted has a lot of DNS records - some of them are set up automatically when you host a domain, others can be set up by hand if required. As an illustration, the A record of a domain name is its IP address i.e. this record shows where the website is located; the MX records reveal where the e-mails are stored, while with an SRV record you can use a domain address for unconventional purposes, including a Voice-over-IP service. The ability to create and modify specific records enables you to have different services with different providers if, for instance, your present host provides stable web hosting, but has issues with the e-mail service, or you simply prefer to get a certain service from a particular company. Although you must be able to set up and edit these records freely and with no restrictions as you own a given domain address, many companies charge extra to give you this option.