What is a Dynamic DNS?
Dynamic DNS is a service that automatically and periodically updates your DNS’s A (IPv4) or AAAA (IPv6) records when your IP address changes. These IP changes are made by your Internet provider.
How does DDNS work?
The DDNS monitors the IP address for changes. When the address changes (which it will if you have a dynamic IP address), the DDNS (or DynDNS) service updates your new IP address.
Why is it useful?
It can be very useful for people who want to host their website, access CCTV cameras, VPN, app or game server from their home computer. It is cheaper than to have a static public IP and by setting up Dynamic DNS, you will avoid the need to update all of your records whenever your IP changes manually. Also, static IP address is not always an option; it depends on your Internet provider.