Cell-to-cell communication is a fascinating process that is essential for maintaining tissue and whole-body homeostasis.Extracellular vesicles(EVs)are cell-derived membrane-bound nanoparticles that are a means of communication between cells.Accumulating evidence indicates that EVs can render either beneficial or harmful outcomes,depending on the specific cargos(e.g.,proteins,lipids,RNAs)transferred between cells.EVs also have great value as diagnostic and prognostic markers of disease because they are present in a variety of biological fluids and carry bioactive molecules from their cells or tissues of origin.Liver cells can both release and receive EVs derived from other cells and emerging evidence indicates that liver EVs play important roles in the pathogenesis of various liver diseases,including liver cancer,viral hepatitis,non-alcoholic fatty liver disease,and alcoholic liver disease.This review provides an overview of the biogenesis and secretion of EVs and summarizes the most recent advances in understanding the role of EVs in liver physiology and diseases.Additionally,we discuss potential applications of liver EVs as biomarkers and in therapeutic approaches to treat liver diseases.