Discuss the detail the Selective Dissemination of Information Service (SDI). Also write whether it is CAS service or not.

The Selective Dissemination of Information Service (SDI) is a type of information retrieval service that helps users identify and receive relevant information on a regular basis. SDI is an automated system that utilizes user profiles and search algorithms to determine what information is most relevant to the user. The service is designed to provide users with up-to-date information in their field of interest without requiring them to actively search for it.

SDI is typically offered by libraries, information centers, and other organizations that provide access to a large collection of information resources. The service works by having the user create a profile that specifies their areas of interest, preferred sources of information, and preferred formats of delivery (e.g. email, ____ ____ _________ ____ __________ ________ _____ _____ _________ _________ _________.
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