This document discusses literature reviews and their importance in research. It begins by explaining that a literature review is an essential preliminary task that acquaints the researcher with existing knowledge in their field. The functions of a literature review are then outlined as bringing clarity and focus to the research problem, improving methodology, broadening the researcher's knowledge, and contextualizing findings. The document provides guidance on how to conduct a literature review, including searching literature sources, reviewing selected literature, developing a theoretical framework, and creating a conceptual framework. It emphasizes that a literature review is time-consuming but rewarding for strengthening a research study.