Modules

Today, there are almost 30 modules included in a standard DotNetNuke-installation; including photo galleries, e-commerce systems, blogs, forums, wiki, mailing lists, video player, html, banners, feedback, google adsense, etc...

If you want to have more functionality, you can buy extended third-party-modules. The modules which you buy on the DotNetNuke Marketplace are all tested and reviewed.
Additionaly, or alternatively, you can make your own modules (if you have some developer-skills).

The modules used in a standard DotNetNuke-installtion are called "Core-Modules" and the extra modules are called "Non-Core-Modules".