An AAAA record is an IP address in the newly launched IPv6 format and it is comprised of 8 groups of hexadecimal digits, as opposed to the IPv4 IPs, which include four groups of numbers in between 1 and 255. An example of an IPv6 address is 3014:0d43:23a3:2354:1320:8f3b:2635:3254 and in this format the number of IPs that may be created is many times greater than the number of the IPv4 addresses. Every domain has its hosting server IP as a record and in essence, that record informs the domain address where the website for it can be found. Depending on the system that the service provider employs, the record will be called A (IPv4) or AAAA (IPv6). Changing this record will allow you to host your site with one provider and your e-mails with a different one, so if you decide to use this kind of redirection to forward a domain to a server that uses an IPv6 address, you'll need to set up an AAAA record for it.