Metallic nanoparticles (MNPs) were synthesized using different methods. Physical and chemical methods were the most common for the synthesis of MNPs. Most recently, biosynthesis of MNPs has been promoted as the best option which is an eco-friendly, inexpensive and energy-effective method. There are several ways to confirm the formation and characterization of MNPs such as UV light, FTIR, XRD, DLS, ICPs, TEM, SEM, and zeta potential.  The mechanism of synthesis involves extracellular and intracellular routes. The extracted NPs can be applied in a variety of applications, including medical, Environmental, industrial, and agricultural applications.