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Neutrophils produce neutrophil extracellular traps (NETs) by expelling their extracellular chromatin embedded with citrullinated histone H3, myeloperoxidase, and other intracellular molecules. Since their discovery in 2004, numerous articles have demonstrated the mechanism of NET formation and their function in innate immunity and inflammation. NET components often play an antimicrobial role, but excessive NETs are deleterious and can cause inflammation and tissue damage. This review highlights recent advancements in the identification of novel pathways and mechanisms of NET formation. We also focus on the specific damaging impact of NETs in individual organs. We then discuss the progress and limitations of various NET detection assays. Collectively, these vital aspects of NETs significantly improve our understanding of the pathobiology of NETs and future diagnostics and therapeutic tools for …