Metabolic associated steatohepatitis is a specific subtype of non-alcoholic fatty liver disease characterized by hepatic steatosis, inflammation, and hepatocellular injury. As an academic concept and research field, it investigates the complex interplay between metabolic dysfunction (including obesity, insulin resistance, dyslipidemia, and hypertension) and the pathogenesis, natural history, and clinical outcomes of this liver pathology, focusing on understanding its mechanisms, identifying diagnostic and prognostic biomarkers, and developing effective therapeutic strategies to prevent its progression to advanced fibrosis, cirrhosis, and hepatocellular carcinoma.