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Introductory information can help provide an overview of the subject, help you better understand your topic, and also give you ideas for other terms and resources. Introductory information can be found in in encyclopedias and dictionaries and can help you start the research process.
The library has a number of online encyclopedias, dictionaries, and reference materials. Read the descriptions or ask a librarian to help you find one that will work well for your topic and information needs.