While thinking of related terms and concepts is useful in searching, some databases, like CINAHL and MEDLINE, also utilize subject headings. Knowing the difference between them and when to use a keyword vs. a subject heading can have an impact on your search results.
Keywords
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Subject Headings
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Looks for word occurrence in multiple locations of results |
Only searches the subject headings field of results |
Is a broader search and will yield more results, not all of them relevant |
Is more precise, and yields less, although more relevant results |
You can "make up" a keyword |
Subject headings are chosen from a preexisting list and cannot be altered |