This book about synthesis and characterization of various types of silver nanoparticles (AgNPs), including chemically synthesized AgNPs, green synthesized AgNPs, and silver-based core-shell nanoparticles. The book also covers the preparation of nanocomposites consisting of AgNPs with Mo, M, Cu, and Zn. The author investigates the potential applications of these nanoparticles in various fields, including medicine, agriculture, and environmental science. The antimicrobial and antidiabetic activities of the synthesized nanoparticles are tested using different bacterial and fungal strains, as well as in vitro models of diabetes. The in vitro cytotoxicity of the nanoparticles is also evaluated using human cell lines. The book provides a detailed analysis of the characterization techniques used to study the morphology, structure, and composition of the synthesized nanoparticles, including X-ray diffraction, transmission electron microscopy, and Fourier transform infrared spectroscopy. The author also discusses the potential mechanisms of action of the nanoparticles in terms of their antimicrobial and antidiabetic activities, as well as their cytotoxic effects on human cells. Overall, this book provides a comprehensive overview of the synthesis, characterization, and potential applications of different types of silver nanoparticles, as well as their potential as antimicrobial, antidiabetic, and cytotoxic agents.