Every single domain name 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. As an example, the A record of a domain address is its IP address i.e. this record shows where the site is situated; the MX records reveal where the e-mails are managed, while through an SRV record you can use a domain for unconventional purposes, including a Voice-over-IP service. Being able to set up and modify particular records enables you to have different services with different providers if, for example, your current host provides dependable web hosting, but has problems with the email service, or you simply prefer to get a certain service from a particular company. Although you should be able to create 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.