This document discusses the difference between primary and secondary source documents. It begins by defining primary sources as first-hand accounts that were created by someone present during the event being documented. Secondary sources are accounts created after the fact that may include analysis or interpretation of original events or information. Understanding the difference is important because primary sources provide direct windows into the past, while secondary sources can contain opinions and interpretations. The document provides examples like diaries, photographs, or government records as primary sources, and textbooks or biographies as secondary sources. It emphasizes the need to critically evaluate secondary sources for author bias.