Each domain name that is registered and hosted has quite a lot of DNS records - some of them are created automatically when you host a domain, others can be created manually if necessary. As an illustration, the A record of a domain name is its IP address i.e. this record shows where the website is situated; the MX records reveal where the e-mails are managed, while using an SRV record you can use a domain address for unconventional purposes, like a Voice-over-IP service. Being able to create and modify certain records allows you to have different services with different providers if, for example, your current host provides dependable web hosting, but has difficulties with the email service, or you simply prefer to get a specific service from a particular company. While you can create and edit these records freely and with no limitations as you own a given domain, lots of companies charge extra to give you this option.