In response to the overwhelming amount of electronic information available on the Internet, there has been a trend towards portals of various kinds in the last few years that help the user to "wade" through the vast number of websites available. These resources, whether "gateways", "web portals", "vortals" or "portals", all provide a single interface from which the user can search either wide ranging or more specific topics.     

Unlike web portals and search engines such as Yahoo!, libraries offer a significant amount of "quality control" with web sites being assessed for relevance, bias and reliability.

In the United Kingdom , the Subject Portals Project (SPP) is an initiative of the Resource Discovery Network, a U.K. based "family of subject-based gateways" which connect "students, teachers and researchers to appropriate, high-quality content on the Internet." These subject gateways or "hubs" represent a wide range of subject areas, including the social sciences, the biological sciences, engineering and the humanities.

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