What is the Dynamic DNS concept?
To begin, Dynamic DNS, also known as DDNS, is a service that immediately updates your IP address (the A or AAAA record) if the host (device) changes it.
When the lease on your IP address expires, your ISP (Internet service provider) can change it automatically.
If you use the device as a server, you can use DDNS to ensure it remains accessible. Otherwise, you won’t be able to reach or determine the new IP address from afar.
Without Dynamic DNS, the connection would break the moment the ISP changed the IP address, making it impossible for someone operating a monitoring server with a camera at home to observe the footage from a distance.