Horizontal Portals: These are the portals are of type general interest. Yahoo!,Lycos,AOL,Freeserve,Sympatico are examples of horizontal portals.
Vertical Portals They provide a gateway to the information pertaining to a specific industry such as insurance, banking, finance, automobile, telecom etc.
B2B Portals The enterprises extend to suppliers and partners by using B2B portals.
B2C Portals The enterprises extend to customers for ordering, billing, services by using B2C portals.
B2E Portals The enterprise knowledge base integration and related applications into user customizable environment is done with B2E portals. This environment is like one stop shop. Source: CoolInterview.com
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