An AAAA record is an IP within the recently introduced IPv6 format and it is made up of 8 groups of hexadecimal digits, in contrast to the IPv4 IPs, which include 4 groups of digits between 1 and 255. An example of an IPv6 address is 3014:0d43:23a3:2354:1320:8f3b:2635:3254 and with this format the amount of IPs that could be created is many times bigger than the number of the IPv4 addresses. Each domain name has its hosting server IP address as a record and in essence, this unique record informs the domain where the site for it can be found. 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 company and your emails with another, so if you decide 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.