Each and every domain name that is registered and hosted has lots of DNS records - some of them are set up automatically when you host a domain, others can be created manually if required. As an illustration, the A record of a domain name is its IP address i.e. this record shows where the website is located; the MX records reveal where the e-mails are stored, while through an SRV record you can use a domain name for unconventional purposes, for instance a Voice-over-IP service. The ability to set up and modify specific records enables you to have different services with different companies if, for illustration, your current host provides dependable web hosting, but has troubles with the email service, or you simply prefer to get a specific service from a certain company. Though you will be able to set up and edit these records freely and with no restrictions as you own a given domain address, a lot of companies charge extra to give you this option.