AAAA is a domain name record, which is essentially the IPv6 address of the web server where the domain name is hosted. The IPv6 system was introduced to replace the current IPv4 system where every Internet protocol address is made up of four sets of decimal digits ranging from 1 to 255 e.g. 18.104.22.168. In comparison, an IPv6 address has 8 groups of 4 hexadecimal digits - which range from 0 to 9 and from A to F. The reason behind this change is the significantly smaller selection of unique IPs the current system supports and the speedy 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 wish to point a domain name to a server which uses this kind of an address, you need to create an AAAA record for it, and not the widely used A record, which is an IPv4 address. The 2 records have the exact same function, but different notations are used, in order to separate the two forms of addresses.