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Wikipedia (Dynamic DNS) said:Dynamic DNS is a method/protocol/network service that provides the capability for a networked device, such as a router or computer system using the Internet Protocol Suite, to notify a Domain Name System (DNS) name server to change, in real time, the active DNS configuration of its configured hostnames, addresses or other information.
It's pretty simple. You have two choices, you can purchase a domain name yourself, or use one of their free domain name extensions, they point the name of your choice to their name servers and redirect it to your IP address, high speed Internet providers are technically dynamic IP addresses so yours can change at any time for any reason, so software installed on your computer, or even your router (I have a router that natively supports DynDNS) will contact the DynDNS servers and update the IP address any time it changes.
I understand what Sceadwian is saying here but I don't see the big picture. Why use DYNdns? What do people use it for?