A literature review offers a summary, and sometimes a commentary, on a certain set of published works all pertaining to the same topic.
It often highlights the connections between specific articles or books and highlights how authors impact and build off of each other. Sometimes these reviews offer the author's opinion on the published works, while at other times they present the information in a neutral manner.
Need Help 
The Cerritos College Librarians can help you with your research in a variety of ways:
Librarians are available during library hours to answer your questions by phone or chat.
(562) 860-2451 x2425