An AAAA record is an IP address in the freshly released IPv6 format and it is made up of eight different sets of hexadecimal numbers, in contrast to the IPv4 IPs, which include four groups of numbers in between 1 and 255. A good example of an IPv6 address is 3014:0d43:23a3:2354:1320:8f3b:2635:3254 and with this format the amount of IPs which can be created is many times bigger than the number of the IPv4 addresses. Every single domain name has its hosting server IP as a record and in essence, this unique record informs the domain where the website for it is located. Depending on the system which the service provider employs, the record will be called A (IPv4) or AAAA (IPv6). Changing this record will allow you to host your site with one provider and your emails with another, so if you choose to use this sort of redirection to forward a domain to a server that uses an IPv6 address, you will have to set up an AAAA record for it.