A literature review is a type of academic essay that examines what has already been written about a topic. As a collection of published research about your topic by recognized scholars and researchers, it is a way for you to examine also what has already been done regarding your research question or problem. Likewise, it summarizes and synthesizes the conducted research driven by guiding principles. Although it is not a research paper, it provides background for your problem and a rationale for your research (Abadiano 2016, 51- 52)