AAAA is a domain address record, that is essentially the IPv6 address of the web server in which the domain name is hosted. The IPv6 system was intended to replace the current IPv4 system where every single Internet protocol address is made up of 4 groups of decimal digits ranging from 1 to 255 e.g. 126.96.36.199. In comparison, an IPv6 address features eight groups of four hexadecimal digits - which range from 0 to 9 and from A to F. The reason for this modification is the substantially smaller range of unique IPs the current system supports and the rapid increase of devices that are connected to the Internet. An example of an IPv6 address would be 2101:1f34:32e2:2415:1365:4f2b:2553:1345. If you wish to point a domain to a web server that uses this type 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 deliver the same exact function, but different notations are used, in order to separate the two types of addresses.