AAAA is a domain name record, which is basically the IPv6 address of the server where the domain is hosted. The IPv6 system was designed to replace the existing IPv4 system where each IP comprises of 4 sets of decimal numbers which range from 1 to 255 e.g. 126.96.36.199. In contrast, an IPv6 address has eight groups of four hexadecimal digits - ranging from 0 to 9 and from A to F. The reason behind this change is the tremendously smaller selection 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 is 2101:1f34:32e2:2415:1365:4f2b:2553:1345. If you wish to direct a domain to a machine that uses such an address, you need to create an AAAA record for it, not the commonly used A record, that is an IPv4 address. The two records deliver the same exact function, yet different notations are used, to distinguish the two types of addresses.