AAAA is a domain name record, that is basically the IPv6 address of the web server where the domain is hosted. The IPv6 system was introduced to replace the existing IPv4 system where every single IP comprises of four sets of decimal numbers between 1 to 255 e.g. 18.104.22.168. However, an IPv6 address has eight groups of four hexadecimal numbers - which range from 0 to 9 and from A to F. The main reason for this transformation is the significantly smaller number of unique IPs that the current system supports and the speedy increase of units 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'd like to forward a domain address to a web server which uses this sort of an address, you need to create an AAAA record for it, and not the widely used A record, which is an IPv4 address. The 2 records have the very same function, but different notations are used, to identify the two types of addresses.