A primary source tells you about a certain event that happened in the past and it's from that event. When studying historical events, historians want their information to be precise and correct. primary sources are firsthand, contemporary accounts of a certain event that was recorded by somebody who witnessed or experienced that event. Primary sources includes the original stuff and it's very important.
Primary sources are important when studying historical events because primary sources "provide the most information and valid facts about the event." Sources such as journals, newspapers, and pictures would be considered a primary source because they were taken, or written during the event.
