AAAA is a domain name record, which is essentially the IPv6 address of the server where the domain name is hosted. The IPv6 system was designed to replace the present IPv4 system where every IP address is made up of four sets of decimal numbers ranging from 1 to 255 e.g. 18.104.22.168. However, an IPv6 address includes 8 groups of 4 hexadecimal numbers - ranging from 0 to 9 and from A to F. The main reason for this change is the tremendously smaller amount of unique IPs that the existing system supports as well as the quick increase of units that are connected to the world wide web. An example of an IPv6 address is 2101:1f34:32e2:2415:1365:4f2b:2553:1345. If you wish to point a domain address to a web server that uses such an address, you will have to create an AAAA record for it, not the widely used A record, which is an IPv4 address. The 2 records provide the same exact function, yet different notations are used, to identify the two forms of addresses.