This document summarizes the key differences between primary and secondary sources. Primary sources are original records created at the time an event occurred by observers, participants, or witnesses. They provide first-hand accounts and evidence of an event. Secondary sources are created after an event to explain, analyze, or provide context to a primary source. They provide deeper understanding but were not created during the event. The document provides examples of primary sources like diaries, photographs, and newspapers and secondary sources like history textbooks, biographies, and movies based on historical events.