AAAA is a domain name record, that's essentially the IPv6 address of the web server in which the domain name is hosted. The IPv6 system was intended to replace the current IPv4 system where every IP address is comprised of four groups of decimal digits which range from 1 to 255 e.g. 18.104.22.168. In comparison, an IPv6 address includes eight groups of four hexadecimal numbers - which range from 0 to 9 and from A to F. The reason for this modification is the considerably smaller selection of unique IPs that the existing system supports as well as the fast increase of devices which are connected to the Internet. A good example of an IPv6 address would be 2101:1f34:32e2:2415:1365:4f2b:2553:1345. If you wish to point a domain address to a web server that uses such an address, you'll have to create an AAAA record for it, not the commonly used A record, that is an IPv4 address. The 2 records have the very same function, but different notations are used, in order to distinguish the two sorts of addresses.