Primary & Secondary sources
Primary sources are original records of information.
"A secondary source is a work that interprets or analyzes an historical event or phenomenon. It is generally at least one step removed from the event." (taken from: http://www.lib.berkeley.edu/instruct/guides/primarysources.html#secondary).
Primary Sources examples: interview, diary creative works (i.e. painting, music, poetry), original research, autobiography, oral history, letters, manuscripts, court reports, birth certificate.
Secondary Source examples: radio, magazines articles, books, documentaries, bibliographies, analytical works, critical essays, reference books, textbooks.
To find out more about primary and secondary sources, definitions & how to search for them, visit this site.