AAAA is a domain name record, that is in essence the IPv6 address of the web server in which the domain is hosted. The IPv6 system was intended to replace the existing IPv4 system in which each IP consists of four sets of decimal digits which range from 1 to 255 e.g. 18.104.22.168. In comparison, an IPv6 address includes 8 sets of 4 hexadecimal numbers - which range from 0 to 9 and from A to F. The reason for this transformation is the significantly smaller selection of unique IPs the existing system supports and the quick increase of products that are connected to the Internet. An illustration of an IPv6 address would be 2101:1f34:32e2:2415:1365:4f2b:2553:1345. If you'd like to point a domain name to a server which uses this sort of an address, you'll have to create an AAAA record for it, not the widespread A record, that is an IPv4 address. The two records deliver the same exact function, yet different notations are used, to identify the two forms of addresses.