Every domain which is registered and hosted has a great deal of DNS records - some of them are set up automatically when you host a domain, others can be created by hand if needed. For instance, the A record of a domain address is its IP address i.e. this record reveals where the website is situated; the MX records reveal where the emails are managed, while through an SRV record you can use a domain address for unconventional purposes, for instance a Voice-over-IP service. To be able to set up and modify particular records permits you to have different services with different companies if, for illustration, your current host provides dependable web hosting, but has problems with the e-mail service, or you simply prefer to get a certain service from a particular company. While you can create and edit these records freely and with no limits as you own a given domain, many companies charge extra to give you this option.