Information Retrieval (IR) is the area of study in which the activity is to obtaining information resources relevant to an information need from a collection of information resources. In this there is overlap in the usage of the terms data retrieval , document retrieval , information retrieval , and text retrieval , but each also has its own body of literature, theory and technologies. IR is interdisciplinary, based on machine field, mathematics, information science, cognitive psychology, arts and statistics.
Information retrieval systems are everyplace: Web search engines, library catalogs, stock catalogs, cookbook indexes and so on. Information retrieval (IR), also called information storage and retrieval (ISR or ISAR) or information organization and retrieval, is the art and power of retrieving from a collecting of items a subset that serves the user's purpose.
Automated information retrieval systems are used to reduce what has been called "Information Overload". Many universities and people libraries use IR systems to provide access to books, journals and other documents. Web search engines are the most available IR applications.
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