If users don't know which main area on the home page to browse for the information they need, they can go to Topics and see information organized under different topic areas. The Topics area is also a good place for subject matter experts to use when they want to organize and publish information about a particular subject. Topics can contain lists, discussion boards, document libraries, and other features that enable people to work together. You must be a member of the Administrator, Web Designer, or Content Manager site group to add, edit, or delete a topic.
Topic areas behave like other areas and are managed in the same way. However, they usually contain highlights of other areas or frequently used content. They are also limited to a single subject. For greater discoverability, you can add listings to more than one topic area.
If your portal site contains a large amount of content, dividing it into topics can be a time-consuming task. To simplify the process, Microsoft Office SharePoint Portal Server 2003 provides an automated tool called the Topic Assistant. After you have assigned a few representative items to each topic, the Topic Assistant compares those sample items to the items that haven't been assigned and then automatically selects the best topic matches.