Primary sources are original, uninterpreted information. Scholars analyze primary sources in order to answer research questions. Examples of primary sources vary by discipline.
Examples in the humanities:
Examples in the social sciences:
Example in the sciences:
In secondary sources, authors analyze and interpret primary source materials.
Secondary sources can be scholarly or popular. Scholarly sources (sometimes called "academic" or "peer-reviewed" sources) are written by and for experts and typically include bibliographies and citations. Popular sources are written for a general, non-expert audience and can be authored by anyone.