An example of a secondary source is a textbook, which interprets and synthesizes information from primary sources to provide an overview or analysis of a topic. Other examples include journal articles that analyze research, biographies, documentaries, encyclopedias, and newspaper editorials that comment on events rather than reporting them firsthand

. Secondary sources differ from primary sources in that they do not present original, firsthand accounts but rather evaluate, interpret, or summarize primary information

. For instance, a biography of a historical figure is a secondary source, while letters or diaries written by that figure are primary sources

. In summary, a textbook or a scholarly article analyzing original research would be a clear example of a secondary source.