An AAAA record is an Internet protocol address within the recently presented IPv6 format and it is comprised of 8 groups of hexadecimal numbers, unlike the IPv4 IPs, that include 4 groups of numbers in between 1 and 255. An illustration of an IPv6 address would be 3014:0d43:23a3:2354:1320:8f3b:2635:3254 and with this format the amount of IPs that could be created is many times larger than the number of the IPv4 addresses. Every single domain has its hosting server IP as a record and in essence, this record informs the domain where the website for it can be found. Depending on the system that the service provider uses, the record will be called A (IPv4) or AAAA (IPv6). Changing this record allows you to host your website with one provider and your emails with a different one, so if you decide to use such a redirection to point a domain address to a server that uses an IPv6 address, you'll need to set up an AAAA record for it.