A Primary source is a first hand or eye witness account of an event. A primary sources enables a researcher to get a clear picture of what actually happened during an historical event or a particular time period.
A Secondary source is a source that analyzes, relates, evaluates, or criticizes based on information gathered from primary sources.
Examples of Primary Sources:
Diaries and Journals
Documents produced by government agencies such as Congress
Examples of Secondary Sources:
Recently published articles on historical topics
Newspaper editorials or articles reporting on previous findings
Books that include analysis, commentary, or criticism