An AAAA record is an IP within the newly introduced IPv6 format and it is made up of 8 groups of hexadecimal numbers, unlike the IPv4 IPs, which feature four sets of numbers 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 which can be created is many times larger than the number of the IPv4 addresses. Each domain has its web hosting server Internet protocol as a record and in essence, this unique record informs the domain name where the site for it can be found. Depending on the system that the service provider employs, the record is going to be called A (IPv4) or AAAA (IPv6). Changing this record will allow you to host your site with one provider and your emails with a different one, so if you choose to use this sort of redirection to forward a domain address to a server that uses an IPv6 address, you'll need to create an AAAA record for it.