Explain the features of different information retrieval systems.

Information retrieval systems play a pivotal role in the management of library and information centers, facilitating efficient access to vast amounts of information. These systems vary in their features, functionalities, and underlying technologies, catering to diverse user needs and preferences. Let's delve into the features of different information retrieval systems commonly used in library and information centers:

1. Traditional Library Catalogs:
   - Bibliographic Records: These systems primarily rely on bibliographic records containing descriptive metadata such as author, title, publication date, subject, and sometimes abstracts.
   - Keyword Searching: Users can search for materials using keywords, titles, authors, or subject headings. Boolean operators like AND, OR, _____ ____ ________ ______ ______ ____ ____ _______ _____.
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