Fairy Tale of Kings (1909) Mikalojus Konstantinas Čiurlionis, Public domain, via Wikimedia Commons.
Different academic disciplines may define primary sources a little differently. Generally speaking, a primary source is an artifact, document, diary, manuscript, autobiography, recording, or any other source of information that was created at the time under study. You might think of primary sources as the raw, unanalyzed data.
Some examples of primary sources are:
A secondary source is a book, periodical, website, etc., that was created using information from primary sources (and sometimes other secondary sources). These sources can analyze, discuss, and give context to primary sources.
Some examples of secondary sources are: