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The document discusses different definitions of a portal from both scientific and IT perspectives. In science, a portal refers to an interdimensional door between realities. In IT, a portal is a starting point or gateway that aggregates information from various sources for users. The document outlines several common ways portals are classified, including by whether they primarily provide information or allow content management, are application-centric or content-centric, and target specific verticals or the horizontal market. Choosing the right definition depends on the specific portal requirements.


