The prominent applications of biosensors are discussed in this state-of-the-art book. The major issue related to biosensor development is the application of biosensors for several practical tasks to maintain a steady and dependable flow of data regarding the indicators of industrial and natural processes as well as the surroundings, thus allowing optimum control and feedback. Biosensors can give important information, since the quality of life depends primarily on our knowledge about what we eat and breathe and how our bodies are able to metabolize the substances which come in our contact. This book essentially lays stress on the applications of biosensors for the purpose of monitoring the quality of food, parameters of environment and biomarkers of health.