A primary source is an eyewitness account of an event.
Primary sources help make reports more accurate and factual. Because
people who were at the event write primary sources, they are more
likely to be true and correct. You feel as if you were there when
the event occurred.
A secondary source is an account of an event by a person
or people who were not at the scene of an event. Secondary sources
may contain facts of what occurred, opinions of experts, or related
facts that did not actually happen at the event.