A narrative review is a type of research article that aims to provide a comprehensive overview and summary of existing literature on a particular topic. Unlike systematic reviews, which follow a strict protocol for searching, selecting, and synthesizing data, narrative reviews typically involve a more qualitative and interpretive approach. In a narrative review, the author(s) will often provide a historical background of the topic, discuss key research findings, identify gaps in the literature, and suggest directions for future research. This type of review is valuable for synthesizing and summarizing a large body of literature, as well as providing insights and context for interpreting research findings. However, because it lacks the rigorous methodology of a systematic review, a narrative review may be more prone to bias and subjectivity in the interpretation of data.