Microbial organisms occupy a peculiar place in the human view of life. Microorganisms represent the richest repertoire of molecular and chemical diversity in nature as they underlie basic ecosystem processes.Microorganisms are used for various purposes including food production and preservation, management of pests and pathogens, bioleaching of metals, increasing soil fertility, generating biofuels, monitoring pollutants, cleaning up of oil spills, waste water treatment, assaying of chemicals and serving as tools for medical research.Besides microorganisms are the major sources of antimicrobial agents and produce a wide range of other important medicinal compounds including enzymes, enzyme inhibitors, antihelminthics, antitumor agents, insecticides, vitamins, immunosuppressants and immunomodulatoThe study of microbial diversity is thus important to solve new and emerging disease problems and to advance biotechnology.