AAAA is a domain address record, that is essentially the IPv6 address of the web server where the domain is hosted. The IPv6 system was intended to replace the current IPv4 system in which every Internet protocol address is comprised of 4 sets of decimal numbers which range from 1 to 255 e.g. 22.214.171.124. In comparison, an IPv6 address has eight sets of 4 hexadecimal numbers - ranging from 0 to 9 and from A to F. The main reason for this transformation is the considerably smaller amount of unique IPs the existing system supports and the rapid increase of gadgets which 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 address to a server that uses this sort of an address, you need to create an AAAA record for it, and not the widespread A record, that is an IPv4 address. The two records have the same exact function, yet different notations are used, in order to differentiate the two sorts of addresses.