AAAA is a domain record, that's basically the IPv6 address of the web server where the domain name is hosted. The IPv6 system was intended to replace the current IPv4 system where every IP is made up of four groups of decimal digits between 1 to 255 e.g. 184.108.40.206. In contrast, an IPv6 address includes eight groups of 4 hexadecimal numbers - which range from 0 to 9 and from A to F. The cause of this modification is the significantly smaller amount of unique IPs the existing system supports and also the fast increase of units that are connected to the Internet. A good example of an IPv6 address would be 2101:1f34:32e2:2415:1365:4f2b:2553:1345. If you want to direct a domain to a web server which uses such an address, you have to create an AAAA record for it, and not the commonly used A record, that is an IPv4 address. The two records provide the very same function, but different notations are used, to distinguish the two sorts of addresses.