Nanobiotechnology is emerging day by day in the today’s technology. Here we are giving the different synthesis procedures of silver nanoparticles and the results of their characterization. All the particles obtained shows nearly similar characteristics. Plant mediated , Algae mediated and fungal mediated are the three different souces taken here. Finally applications of these nanoparticles are mentioned. These nanoparticles are quite impressive and have wide bandwidth of applications.