Each and every domain which 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 manually if necessary. For instance, the A record of a domain address is its IP address i.e. this record shows where the website is situated; the MX records reveal where the emails are managed, while with an SRV record you can use a domain name for unconventional purposes, including a Voice-over-IP service. The ability to set up and modify certain records permits you to have different services with different providers if, for example, your present host provides dependable web hosting, but has difficulties with the email service, or you simply prefer to get a specific service from a certain company. Though you will be able to set up and edit these records freely and with no restrictions as you own a given domain name, lots of companies charge extra to give you this option.