What do you understand by Literature Review? What role does it play in research?

A literature review is a critical and comprehensive analysis of existing research, studies, books, journal articles, and other relevant sources on a particular topic. It helps in identifying gaps in knowledge, establishing the context of a study, and demonstrating how a new research work builds upon previous studies. A well-conducted literature review synthesizes information, evaluates sources, and provides insights into the trends, methodologies, and debates within a research domain. 

A literature review is not merely a summary of past works but an analytical synthesis that critically examines the strengths, weaknesses, and contributions of different sources. It serves as a foundation for research by highlighting existing knowledge, gaps, and areas requiring further investigation. 

### Types of Literature Reviews
Different types of literature reviews serve specific research purposes. These include:

1. Narrative Review – Provides an overview of the existing literature on a topic without a strict methodological framework. It is useful for broad discussions and identifying general trends.
  
2. Systematic Review – Follows a structured methodology to analyze a large body of literature by setting inclusion and exclusion criteria. It is used to provide objective conclusions about a research area.
  
3. Meta-Analysis – Combines statistical results from multiple studies to derive quantitative insights about a research question. It is common in medical and social sciences.
  
4. Theoretical Review – Examines theories and ___ __________ ____ ___ _______ ___ __________ __________ _______ ______ ________.
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