Every domain that's 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 necessary. As an example, the A record of a domain is its IP address i.e. this record shows where the website is located; the MX records show where the emails are managed, while with an SRV record you can use a domain address for unconventional purposes, such as a Voice-over-IP service. The ability to set up and modify certain records allows you to have different services with different companies if, for illustration, your present host provides dependable web hosting, but has issues with the e-mail service, or you simply prefer to get a specific service from a certain company. Although you will be able to create and edit these records freely and without any limitations as you own a given domain address, lots of companies charge extra to give you this option.