The chapter reviews the Implicit Association Test (IAT) and its applications in various fields, including social and cognitive psychology, clinical psychology, developmental psychology, neuroscience, market research, and health psychology. The IAT is a method for indirectly measuring the strength of associations between concepts, such as gender and evaluation, by requiring participants to sort stimulus items into two categories using two response options. The IAT is designed to be easier when the two concepts share a strong association. The chapter discusses the procedural details of the IAT, including the selection of stimulus materials, the design of the task, and the analysis of results. It also addresses issues such as internal validity, extraneous influences, reliability, and construct validity. The IAT has been found to have satisfactory internal consistency and test-retest reliability, and it is less fakeable than self-report measures. The chapter explores the relationship between the IAT and other implicit measures, self-report measures, and its predictive validity. It also examines the malleability and development of implicit cognition, particularly in children. Finally, the chapter discusses the interpretation of IAT effects, including the relative measurement of association strengths, the influence of stimulus items versus category labels, and the cognitive processes and neurological correlates of IAT effects.The chapter reviews the Implicit Association Test (IAT) and its applications in various fields, including social and cognitive psychology, clinical psychology, developmental psychology, neuroscience, market research, and health psychology. The IAT is a method for indirectly measuring the strength of associations between concepts, such as gender and evaluation, by requiring participants to sort stimulus items into two categories using two response options. The IAT is designed to be easier when the two concepts share a strong association. The chapter discusses the procedural details of the IAT, including the selection of stimulus materials, the design of the task, and the analysis of results. It also addresses issues such as internal validity, extraneous influences, reliability, and construct validity. The IAT has been found to have satisfactory internal consistency and test-retest reliability, and it is less fakeable than self-report measures. The chapter explores the relationship between the IAT and other implicit measures, self-report measures, and its predictive validity. It also examines the malleability and development of implicit cognition, particularly in children. Finally, the chapter discusses the interpretation of IAT effects, including the relative measurement of association strengths, the influence of stimulus items versus category labels, and the cognitive processes and neurological correlates of IAT effects.