AAAA is a domain record, that is in essence the IPv6 address of the server in which the domain is hosted. The IPv6 system was intended to replace the current IPv4 system in which every Internet protocol address is comprised of four groups of decimal digits ranging from 1 to 255 e.g. 22.214.171.124. In comparison, an IPv6 address features 8 sets of 4 hexadecimal digits - ranging from 0 to 9 and from A to F. The cause of this change is the tremendously smaller range of unique IPs the existing system supports and also the quick increase of products that are connected to the world wide web. A good example of an IPv6 address is 2101:1f34:32e2:2415:1365:4f2b:2553:1345. If you wish to direct a domain name to a machine which uses such an address, you need to create an AAAA record for it, not the widespread A record, which is an IPv4 address. The 2 records provide the exact same function, but different notations are used, to distinguish the two types of addresses.