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Portals, as referred herein, are websites that aim to be entry points to the World Wide Web, typically offering search engines and/or links to useful pages, and possibly news or other services. These services are usually provided for free in the hope that users will make the site their default home page or at least visit it often. Popular examples are Yahoo and MSN. Most portals on the Internet exist to generate advertising income for their owners; others may be focused on a specific group of users and may be part of an intranet or extranet. Some may just concentrate on one particular subject, like technology or medicine, and are known as vertical portals.
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