Dynamic DNS (DDNS) is a service that automatically updates the DNS records for a domain name whenever the IP address of the host changes. This is particularly useful for users with dynamic IP addresses, which are commonly assigned by Internet Service Providers (ISPs) and can change periodically.

With DDNS, you can maintain a consistent domain name (like example.com) that points to your changing IP address. This is beneficial for various applications, such as:

1. **Remote Access**: Accessing home networks or devices remotely without needing to remember the changing IP address.

2. **Hosting Services**: Running servers (like web, FTP, or game servers) from a home network.

3. **Surveillance Systems**: Accessing security cameras or other monitoring systems remotely.

DDNS services typically involve a client application that runs on the host device, which detects IP address changes and communicates with the DDNS provider to update the DNS records accordingly.

-answered by duck.ai