An AAAA record is an Internet protocol address in the recently introduced IPv6 format and it comprises of 8 groups of hexadecimal numbers, as opposed to the IPv4 IPs, which include 4 sets of digits in between 1 and 255. An illustration of an IPv6 address is 3014:0d43:23a3:2354:1320:8f3b:2635:3254 and with this format the number of IPs which can be created is many times higher than the number of the IPv4 addresses. Every single domain has its website hosting server IP as a record and in essence, that record instructs the domain where the site for it is. Depending on the system that the company uses, the record is going to be called A (IPv4) or AAAA (IPv6). Changing this record enables you to host your site with one company and your emails with a different one, so if you decide to use this kind of redirection to point a domain address to a server that uses an IPv6 address, you'll need to create an AAAA record for it.