Keyword examples:
Academic libraries use Library of Congress Subject Headings to describe materials. Think of these as pre-defined hashtags that cannot be modified.
Subject headings can be useful for discovering books and materials quickly, so it is good practice to look at the subject headings that are assigned to the books that you are interested in.
However, relying on subject headings alone can be very limiting. For example, they cannot describe multi-disciplinary or complex topics, and it is impossible to apply a subject heading to every topic that is covered in a given source.
Subject Heading examples:
Kingston, Maxine Hong -- Criticism and interpretation
Kingston, Maxine Hong. Woman warrior
Rodriguez, Richard, 1944- -- Criticism and interpretation
African Americans in literature
Mexican Americans in literature
Chinese literature -- 20th century -- History and criticism
Chinese literature -- 20th century -- Women authors
American literature -- Minority authors -- History and criticism
American literature -- 20th century -- History and criticism
Ethnic groups -- United States -- History -- 20th century
Emigration and immigration in literature