Key word searching is different from "subject searching." What's the Difference?
When you do a "key word" search, the computer searches only for the exact word or words that you enter. When you do a subject search (if one is available) the computer searches for items that are similar in concept to the term that you entered.
Library catalogs use subject headings from the Library of Congress. Online databases and some search engines use their own subject categories.
Check the Thesaurus of each online database to find out what subject terms it uses.
Sometimes you can indicate whether you want the key word search to be performed on all fields or only on specific fields (subject, title, abstract, or full text).
The exercise below demonstrates how to use key words to locate the subject headings in an online library catalog.