Primary vs Secondary Sources
One definition for Primary source is a source that originates at the time of an event, a witness to the event in their own words. Based on that definition, a Secondary source is than a later witness, interpretation, or commentary on the primary source.
Primary source examples: letters, newspapers, diaries, interviews, artifacts, novels, plays, poems, movies and videos, paintings or photos, newspapers, speeches, memoirs, diaries, letters (even texts, IMs, emails and SnapChat!!), interviews, census records, and obituaries.