Specialized or vertical industry portals which provide a "subWeb" of
information, product listings, discussion groups,
and other features. These vertical portal sites have a broader purpose than the procurement sites (although they may also support buying and selling).
Brokering sites that act as an intermediary between someone wanting a product or service and potential providers. Equipment leasing is an example.
Information sites (sometimes known as infomediary), which provide information about a particular industry for its companies and their employees. These include
specialized search sites and trade and industry standards organization sites.