AAAA is a domain address record, which is in essence the IPv6 address of the web server in which the domain is hosted. The IPv6 system was intended to replace the present IPv4 system in which each and every Internet protocol address comprises of 4 sets of decimal numbers between 1 to 255 e.g. 18.104.22.168. However, an IPv6 address includes eight groups of four hexadecimal digits - which range from 0 to 9 and from A to F. The reason for this modification is the tremendously smaller amount of unique IPs the current system supports and the rapid increase of devices which are connected to the world wide web. An illustration of an IPv6 address would be 2101:1f34:32e2:2415:1365:4f2b:2553:1345. If you wish to point a domain name to a web server which uses this kind of an address, you'll have to create an AAAA record for it, not the widespread A record, that is an IPv4 address. Both records deliver the same exact function, but different notations are used, so as to distinguish the two types of addresses.