Each and every domain name 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 set up manually if necessary. 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 show where the emails are stored, while using an SRV record you can use a domain address for unconventional purposes, including a Voice-over-IP service. To be able to set up and modify certain records permits you to have different services with different providers if, for illustration, your present host provides dependable web hosting, but has difficulties with the e-mail service, or you simply prefer to get a certain service from a specific company. Though you must be able to create and modify these records freely and with no limitations as you own a given domain, some companies charge extra to give you this option.