The book "Microbes-Redefined Personality" is intended primarily as a text book of Science Teachers and students of Biological sciences, interested in microbes and microbiology. It presents information that is mandatory in the modern aspects of biological development, Economics of microorganisms and Environmental implications. The content has been prepared as a resource material for students, researchers in the field of Microbiology and others concerned with science Education in general. The present age is marked by rapid Progress and development in science.