A primary source is an original document (film, photograph, object, etc.) created during the period they document. They may be a first-hand account of an event created during the time period being studied, or at a later date by a participant in the events being studied.
Secondary sources offer an analysis, interpretation or a restatement of primary sources and are considered to be persuasive. They often involve generalization, synthesis, interpretation, commentary or evaluation in an attempt to convince the reader of the creator's argument. They often attempt to describe or explain primary sources.
Examples of secondary sources include: