AAAA is a domain name record, which is essentially the IPv6 address of the server in which the domain name is hosted. The IPv6 system was intended to replace the current IPv4 system where each and every IP address comprises of 4 sets of decimal numbers ranging from 1 to 255 e.g. 184.108.40.206. On the other hand, an IPv6 address has eight groups of four hexadecimal numbers - from 0 to 9 and from A to F. The reason for this modification is the tremendously smaller amount of unique IPs that the existing system supports as well as the quick increase of products which are connected to the Internet. An example of an IPv6 address is 2101:1f34:32e2:2415:1365:4f2b:2553:1345. If you need to point a domain to a machine that uses such an address, you have to create an AAAA record for it, not the widespread A record, that is an IPv4 address. The 2 records deliver the exact same function, but different notations are used, so as to differentiate the two forms of addresses.