Primary Sources are original pieces of work. They differ in content and format depending on the particular discipline you are researching. Secondary sources are articles, books, essays, and other works written about primary sources.
For Literature Scholars, primary sources can be
The original manuscripts of a creative work, such as a novel or a collection of poetry.
A published work that is both original and creative: such as a published novel or play.
Letters or other correspondence, diaries, journals, autobiographies or memoirs of literary authors