AAAA is a domain name record, that's basically the IPv6 address of the web server in which the domain is hosted. The IPv6 system was designed to replace the present IPv4 system where each Internet protocol address comprises of four sets of decimal numbers which range from 1 to 255 e.g. 18.104.22.168. However, an IPv6 address has 8 groups of four hexadecimal numbers - which range from 0 to 9 and from A to F. The reason behind this modification is the significantly smaller number of unique IPs the current system supports and the quick increase of units that are connected to the world wide web. 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 web server which uses this kind of an address, you need to create an AAAA record for it, not the widely used A record, that is an IPv4 address. Both records deliver the same exact function, but different notations are used, so as to distinguish the two forms of addresses.