AAAA is a domain name record, that is basically the IPv6 address of the server where the domain name is hosted. The IPv6 system was designed to replace the present IPv4 system in which each IP is made up of four groups of decimal numbers between 1 to 255 e.g. 5.168.208.143. However, an IPv6 address has 8 groups of 4 hexadecimal digits - ranging from 0 to 9 and from A to F. The reason for this modification is the considerably smaller number of unique IPs that the current system supports and also the quick increase of products which are connected to the world wide web. A good example of an IPv6 address would be 2101:1f34:32e2:2415:1365:4f2b:2553:1345. If you wish to direct a domain to a server which uses this kind of an address, you need to create an AAAA record for it, and not the widespread A record, that is an IPv4 address. The 2 records have the exact same function, yet different notations are used, to identify the two forms of addresses.