The book is divided into fifteen chapters that cover various aspects of micro-organism-based biotechnology, including recent methodologies such as advanced molecular techniques, as well developments in classical microbiological techniques. The authors also explain how the latest and classical techniques are being used in modern-day microbial biotechnology. All chapters were written by experts from prominent universities, research laboratories, and institutes around the globe. Above all, they focus on recent advances in microbial technology that promote the welfare of living beings and the environment. Microbes in human welfare from different angles starting from source of antibiotics to fermented food to production of biofuel have been discussed with environmental relevance. Separate chapters discussing the use of microbes for remedy of environmental problems help the book to stand with the moto of sustainable development and protection of nature. Global problem in clinical microbiology is discussed with plausible novel remedial approaches. Further, it explains how and why microbes play an important role in preserving the welfare of living beings and the environment. Many bacteria play a significant part in cleaning our environment by detoxifying various xenobiotic compounds, while several microbes produce secondary metabolites that are useful to human beings.