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Information Retrieval

Information Retrieval

Information Retrieval refers to the process, methods, and procedures of searching, locating, and retrieving recorded data and information from a file or database. In libraries and archives modern information retrieval is done by searching full-text databases, locating items from bibliographic databases, and document supply via a network.

Information retrieval (IR) is the activity of obtaining information system resources that are relevant to an information need from a collection of those resources. Searches can be based on full-text or other content-based indexing. Information retrieval is the science of searching for information in a document, searching for documents themselves, and also searching for the metadata that describes data, and for databases of texts, images or sounds.¹

Information retrieval, Recovery of information, especially in a database stored in a computer. Two main approaches are matching words in the query against the database index (keyword searching) and traversing the database using hypertext or hypermedia links. Keyword searching has been the dominant approach to text retrieval since the early 1960s; hypertext has so far been confined largely to personal or corporate information-retrieval applications. Evolving information-retrieval techniques, exemplified by developments with modern Internet search engines, combine natural language, hyperlinks, and keyword searching. Other techniques that seek higher levels of retrieval precision are studied by researchers involved with artificial intelligence.²

A print or computer-based system used to search and locate information in a file, database, or other collection of documents is called an information retrieval system.


Boolean, Probabilistic, and Vector-space are the classical models of information retrieval.


List of questions, answers, and quizzes on Information Retrieval from Library and Information Science Questions Answers Quizzes. Please visit this collection and locate questions given below under the heading "Unit VIII - Library Automation, Information Systems, LIS Organizations and Networks" where you will also find their URLs. having answers and further explanations.
  • Which of the following is not a classical model of information retrieval? [(1) Boolean (2) Cluster (3) Probabilistic (4) Vector-space]



1. Wikipedia, "Information retrieval," (accessed February 21, 2020).

2. Encyclopaedia Britannica, "Information retrieval," (accessed February 21, 2020).


Article Title
  • Information Retrieval

Website Name
  • Librarianship Studies & Information Technology


Last Updated
  • 2020-02-21

Original Published Date
  • 2020-02-21

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