
A tag is basically a category name, something that you file a myriad of things under. For example, the above picture has Web 2.0 as the main resource for this tag cloud. The more relavant subjects, websites to Web 2.0 are coloured, bolded and they have a bigger font that the others. Convergence, Participation, Remixability, Standarzidation, Design, Economy and Usability are all in orange and bolded so that things like CSS Design and Wikis are the next step down. This allows you to find not only the components of Web 2.0 (or any subject you are searching for) but those that are most relavant to Web 2.0 first so that you know exactly what you are searching for. As well as social networking you can use Del.ici.ous to tag websites to your account so that they are all there, but again they are all related to one subject. You can also use ZoomCloud to make a tag cloud (the example above) that allows you to see all the components of your search.