This Book focuses on Synthesis and characterization of ZnS nanoparticle. Idea of Microwave irradiation to synthesize nanoparticle in varied molar environments is the inception of research work presented here. Book progress to discover the structural, optical, thermal properties of ZnS nanoparticles using X-ray Diffraction Analysis, Energy Dispersive Analysis of X-rays, UV-VIS absorption Spectroscopy, Transmission Electron Microscopy, Raman Spectroscopy, Atomic Force Microscopy, Thermogravimatric analysis. ZnS being an immensely important material in optical application, its characterization result and conclusions drawn in this book will help researchers working in the field of nanoscience and students pursuing their masters in solid state physics.