AAAA is a domain record, which is basically the IPv6 address of the server where the domain name is hosted. The IPv6 system was introduced to replace the existing IPv4 system in which each and every Internet protocol address is made up of 4 groups of decimal digits which range from 1 to 255 e.g. 188.8.131.52. In contrast, an IPv6 address has eight groups of four hexadecimal digits - which range from 0 to 9 and from A to F. The main reason for this modification is the tremendously smaller number of unique IPs the current system supports and also the rapid increase of gadgets that 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'd like to direct a domain name to a server that uses this sort of an address, you will need to set up an AAAA record for it, and not the widespread A record, that is an IPv4 address. The 2 records provide the same exact function, yet different notations are used, in order to identify the two forms of addresses.