AAAA is a domain name record, which is essentially the IPv6 address of the server in which the domain name is hosted. The IPv6 system was intended to replace the present IPv4 system where each and every Internet protocol address is comprised of 4 groups of decimal digits which range from 1 to 255 e.g. 5.168.208.143. In comparison, an IPv6 address includes 8 groups of 4 hexadecimal digits - which range from 0 to 9 and from A to F. The reason behind this modification is the substantially smaller number of unique IPs that the existing system supports and also the speedy increase of units 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 need to point a domain to a server which uses this type of an address, you'll have to create an AAAA record for it, not the commonly used A record, which is an IPv4 address. The two records have the same exact function, but different notations are used, in order to identify the two types of addresses.