Content Management is a system to manage your web presence.
A Portal content management system is designed to be a complete website presence. Portal content management systems allow you to create an entire community. Portal systems usually include forums, downloads, user signups, email lists, and much more. These systems lots of features, but are generally much more complicated to setup and operate. Also a larger system with more modules will usually mean you need to be much more security aware about the product.
Some examples of Portal content management systems are PHP Website, and PHP Nuke. These CMS products are open-source, and are very easy to setup and run. It is probably easier to start out with a Portal content management system to see if a CMS works for you or your business needs.
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