An AAAA record is an IP within the recently launched IPv6 format and it consists of eight sets of hexadecimal digits, unlike the IPv4 IPs, which feature 4 groups of numbers in between 1 and 255. A good example of an IPv6 address would be 3014:0d43:23a3:2354:1320:8f3b:2635:3254 and with this format the total number of IPs that can be created is many times larger than the number of the IPv4 addresses. Every single domain name has its web hosting server IP as a record and in essence, that record informs the domain address where the website for it can be found. Depending on the system that the service provider 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 provider and your email messages with another, so if you choose to use this sort of redirection to point a domain name to a server that uses an IPv6 address, you will need to create an AAAA record for it.