Keywords - also known as "tags" - are a way for content, objects and people to be found throughout Developing t2t.com.
Keywords are case insensitive, and separated with commas. This allows for keywords consisting of phrases as well as individual words.
When a keyword has been used more than once, it turns into a link. If you click on that link, you'll see a search page that lists every other object in the system which has been tagged with that keyword, allowing you to very quickly find relevant content.
Example:
Teacher Dave lists teacer training as an interest on his profile. This is a keyword field. You can click on teacher training to see every relevant object in the system: not only every other user interested in teacher training, but also every weblog post, every uploaded file, and more.
Keywords are a very simple, but powerful, way of linking content throughout the site.