This review discusses the development of biosensors and the use of nanostructured materials in biosensing technology. Biosensors are devices that integrate a biological element with an electronic component to generate a measurable signal. They are used in various applications, including healthcare, environmental monitoring, and food quality control. The main challenges in biosensor development include efficient signal detection, transducer performance, and miniaturization. These challenges can be addressed by integrating nanomaterials, which have high surface-to-volume ratios, good conductivity, and tunable properties. Nanomaterials such as nanoparticles, nanowires, nanorods, carbon nanotubes, and quantum dots are used in biosensors for their unique properties. The review also discusses the evolution of biosensors, their classification based on bioreceptors and transducers, and recent advancements in biosensing technology using nanomaterials. It highlights the importance of selectivity, sensitivity, linearity, response time, reproducibility, and stability in biosensor performance. The review covers various types of biosensors, including enzyme-based, antibody-based, aptamer-based, whole-cell-based, and nanoparticle-based biosensors. It also discusses immobilization techniques, transduction methods, and the classification of biosensors based on transducers. The review emphasizes the role of nanomaterials in enhancing biosensor performance and their potential in various applications.This review discusses the development of biosensors and the use of nanostructured materials in biosensing technology. Biosensors are devices that integrate a biological element with an electronic component to generate a measurable signal. They are used in various applications, including healthcare, environmental monitoring, and food quality control. The main challenges in biosensor development include efficient signal detection, transducer performance, and miniaturization. These challenges can be addressed by integrating nanomaterials, which have high surface-to-volume ratios, good conductivity, and tunable properties. Nanomaterials such as nanoparticles, nanowires, nanorods, carbon nanotubes, and quantum dots are used in biosensors for their unique properties. The review also discusses the evolution of biosensors, their classification based on bioreceptors and transducers, and recent advancements in biosensing technology using nanomaterials. It highlights the importance of selectivity, sensitivity, linearity, response time, reproducibility, and stability in biosensor performance. The review covers various types of biosensors, including enzyme-based, antibody-based, aptamer-based, whole-cell-based, and nanoparticle-based biosensors. It also discusses immobilization techniques, transduction methods, and the classification of biosensors based on transducers. The review emphasizes the role of nanomaterials in enhancing biosensor performance and their potential in various applications.