What is the difference between a primary and a secindary source?

A primary source is an original document or firsthand account created during the time under study, such as diaries, speeches, or original research articles. In contrast, a secondary source analyzes, interprets, or critiques primary sources, like textbooks, articles, or documentaries that summarize or evaluate the original material. Essentially, primary sources provide direct evidence, while secondary sources offer context and commentary on that evidence.