In the social sciences and the sciences, scholars use the terms "primary" and "secondary" differently from scholars in the arts and humanities.
Primary research refers to the research conducted by the authors of the original source. The source will describe the authors' methodology, results and conclusions. This might be raw data, letters, research or study, tests, news reports, interviews, or some journal articles.
Secondary research describes or analyzes the research done by others. These include news analyses, magazine articles, some journal articles, scholarly books, opinion pieces or editorials. These can be excellent resources that can lead you to additional primary research on your topic.