Subject headings are specific, predefined terms that the Library of Congress assigns to printed material. The indexers who assign subject headings must use only terms that are listed in this "controlled vocabulary," which typically does not include multi-disciplinary or complex topics. Below are examples of subject headings:
Child welfare
Political planning
Education
Public policy
Social justice in art
Social policy
Social justice and education
Social sciences
Poverty
gender inequality
income inequality
pay equity - united states
wages - women - united states
income - united states
Unlike Subject Headings which use a precise, controlled vocabulary, Keywords are your own search terms that best express the essence of your topic.
Advantages to using keywords:
Disadvantages of using keywords: