AAAA is a domain address record, that is essentially the IPv6 address of the web server where the domain name is hosted. The IPv6 system was introduced to replace the existing IPv4 system in which each Internet protocol address consists of four groups of decimal numbers between 1 to 255 e.g. 18.104.22.168. On the other hand, an IPv6 address includes eight sets of 4 hexadecimal numbers - which range from 0 to 9 and from A to F. The cause of this modification is the tremendously smaller range of unique IPs which the current system supports and also the fast increase of gadgets that are connected to the Internet. A good example of an IPv6 address is 2101:1f34:32e2:2415:1365:4f2b:2553:1345. If you need to forward a domain name to a web server that uses this type of an address, you'll have to create an AAAA record for it, and not the commonly used A record, that is an IPv4 address. Both records have the same exact function, yet different notations are used, to separate the two types of addresses.