a CMS is a content management system, so anything that can manage any sort of content could be classified as a content management system. In the case of CNET you have articles and reviews as content (as well as a bunch of other things). These are most likely managed through a graphical user interface and stored in a database.
Some of the more popular ones include Wordpress (a blogging software but could also be utilised as a light CMS), Joomla, and Drupal (for the more experienced ones) - all open source & php/mysql - not going into other languages at this point.
that’s an entirely different matter though and depends on how well the CMS utilises a theming engine. Wordpress is pretty good and can turn out the stored content very flexible and in almost any form and layout you wish, so is Drupal for example. Joomla on the other hand is a bit less user-friendly here.
thanks. I appreciate the explanation.
I had an idea, but wasnt certain.
I was watchin a video about wordpress 3.0 and how it can be used as cms (like u stated), so that made me curious how they could get it to start looking like cnet.