A critical review is a type of evaluation of existing research studies, theories, or methodologies in a particular field of study. It involves analyzing and interpreting the strengths and weaknesses of the research, identifying gaps in knowledge, and suggesting areas for future research. Critical reviews are often used to determine the quality and significance of existing research, to inform the development of new research, and to assess the theoretical underpinnings of a particular topic. They are typically written in a structured and systematic manner, focusing on key points of debate and controversy within the field.