Every domain which is registered and hosted has quite a lot of DNS records - some of them are set up automatically when you host a domain, others can be created manually if needed. As an illustration, the A record of a domain name is its IP address i.e. this record shows where the site is situated; the MX records reveal where the e-mails are stored, while using an SRV record you can use a domain address for unconventional purposes, like a Voice-over-IP service. To be able to create and modify specific records enables 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 specific company. Although you must be able to set up and edit these records freely and with no limitations as you own a given domain name, lots of companies charge extra to give you this option.