Every domain name which is registered and hosted has a lot of DNS records - some of them are created automatically when you host a domain, others can be set up manually if required. For instance, the A record of a domain is its IP address i.e. this record reveals 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. The ability 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 troubles with the email service, or you simply prefer to get a particular service from a particular company. Although you can set up and edit these records freely and with no restrictions as you own a given domain name, many companies charge extra to give you this option.