A "hub" collects a number of feeds, feed items and remixed feeds together into one organized "hub" of information.
A hub contains many input feeds (look at the "input" tab) that serve as input sources. These items in these input feeds are downloaded and parsed for titles, content, tags, and other metadata. These feed items serve as the basic unit of information in a tagteam hub.
A hub also contains remixed feeds, which are remixes of feeds, feed items and tags.