Every domain name 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 manually if necessary. For example, 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 e-mails are managed, while with an SRV record you can use a domain name for unconventional purposes, including a Voice-over-IP service. Being able to create and modify particular records permits you to have different services with different companies if, for illustration, your present host provides dependable web hosting, but has problems with the e-mail service, or you simply prefer to get a specific service from a certain company. Though you should be able to set up and modify these records freely and without any limits as you own a given domain name, many companies charge extra to give you this option.