Secondary literature is an important part of the research process of a topic. Secondary literature is any form of literature the condenses, synthesizes, or draws upon primary literature. These sources provide a starting place for understanding a topic because they are easy to read and provide background information and they may be useful in pulling out keywords, phrases, or concepts. When using secondary sources it is important to know that is that they are not peer-reviewed and they include a second layer of interpretation of original data that may or may not be correct.
Example include books, review articles, magazine and newspaper articles, handbooks, and factsheets.