AAAA is a domain address record, which is basically the IPv6 address of the server in which the domain name is hosted. The IPv6 system was intended to replace the current IPv4 system in which each IP address comprises of 4 groups of decimal digits ranging from 1 to 255 e.g. 18.104.22.168. In contrast, an IPv6 address includes eight groups of 4 hexadecimal digits - which range from 0 to 9 and from A to F. The reason for this change is the tremendously smaller amount of unique IPs the existing system supports and the quick increase of devices that are connected to the Internet. An example of an IPv6 address would be 2101:1f34:32e2:2415:1365:4f2b:2553:1345. If you want to point a domain address to a web server which uses such an address, you will need to create an AAAA record for it, and not the widely used A record, that is an IPv4 address. The two records have the exact same function, but different notations are used, to separate the two types of addresses.