Primary sources are the raw materials of history — original documents and objects which were created at the time under study. They are different from secondary sources, accounts or interpretations of events created by someone without firsthand experience.
-- Library of Congress
Primary Source Examples in the Humanities
Primary Source Examples in the Sciences
Secondary sources, like biographies, histories, and criticism, analyze and interpret primary sources.
Test your understanding of primary versus secondary sources.
Which sources are primary and which are secondary? Explain why!