An AAAA record is an IP within the freshly launched IPv6 format and it consists of 8 different sets of hexadecimal digits, as opposed to the IPv4 IPs, which include 4 sets of digits between 1 and 255. An illustration of an IPv6 address would be 3014:0d43:23a3:2354:1320:8f3b:2635:3254 and with this format the amount of IPs that may be created is many times greater than the number of the IPv4 addresses. Every domain has its hosting server IP as a record and in essence, this record tells the domain address where the site for it is. Depending on the system that the company employs, the record is going to be called A (IPv4) or AAAA (IPv6). Changing this record will allow you to host your site with one company and your e-mails with another, so if you choose to use this sort of redirection to point a domain address to a server that uses an IPv6 address, you'll need to create an AAAA record for it.