Textbook in PDF format The book offers a comprehensive exploration of cutting-edge nano-sensor technologies and their critical role in the field of biomedicine. This book covers a diverse range of topics, from fluorescence-based nanosensors that detect and quantify nanovesicles at the nanoscale to the recent advances in nano biosensors for agriculture and health applications. It provides valuable insights into the green synthesis of silver nanoparticles and their biomedical applications, highlighting eco-friendly approaches to nanomaterial production. The use of FRET-based tools for real-time quantification of vitamins and bioimaging is also extensively discussed, presenting innovative techniques for analysis. The book further delves into the potential of nanosensors in medicine, exploring the characteristic features that make them promising candidates for various medical applications. It also covers the application of fluorescent biosensors for intracellular signalling analysis, paving the way for understanding complex cellular processes