What is an example of a secondary source?

A biography or summary of a primary document is an example of a secondary source because it interprets, analyzes, or summarizes information derived from primary sources rather than presenting firsthand accounts or original materials. Secondary sources provide context, commentary, or critique of the original work, allowing readers to gain insights based on the perspectives of others who have studied the primary source.

In contrast, a primary document from the time period is about firsthand accounts or original materials created during that specific time. An article written by an eyewitness would also be a primary source since it offers direct evidence or testimony from someone who experienced the events. A novel based on true events, while it may draw inspiration from real occurrences, is still a creative retelling rather than a direct representation of historical documents or evidence, thus not qualifying as a primary source either.