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Dynamic DNS using DynDNS

One day I'm looking at my DSL modem's feature. There I see a DDNS tab, I don't know what DDNS mean until I open it. So, DDNS means Dynamic DNS. At this point I still don't know what is ddns used for. But there's a link to dyndns.org. and a form with username, password and domain in use. Still don't know what the use of it, I open dyndns website and register a free account. Looking for dynamic dns section, add a new host and add this information to my modem's setting (hostname, username, email, and password). save it and open the domain I add from browser. Waw, I'm surprised that I can access my modem's administration page from internet. Now I wonder, can I make my laptop's http service accesible internet?.

Looking around dyndns website and I found a download page. I download an update client for windows, because right now I'm using it. There's client app for linux and mac too. After download and install it, I set the same information i put into my modem's config and do an update IP. after it's done I surf my laptop using hostname I registered earlier. I can see my server's welcome page. I didn't satisfy with the result, so I contact some online friend to open the hostname from their browser and they did see the same welcome page. Hmm, so this is the use of dynamic dns. I think this is what my friend abud need.