The most common DNS record used, an A record simply maps a hostname to an IPv4 address (such as 18.104.22.168). This is required so users are able to reach your website or application using its hostname rather than remembering the IPv4 address.
The AAAA Record (Sometimes called a Quad A) operates in the exact same way as A records except they point to an IPv6 address (such as FE80::0202:B3FF:FE1E:8329). The IPv6 protocol is the successor to IPv4. While it is not currently as widely used, the need for IPv6 usage is growing constantly as the available address space in the IPv4 protocol is quickly running out.