Introduction to emerging biosensing technologies.

Wearable biosensors offer real-time, non-invasive monitoring of vital physiological and biochemical signals, transforming the landscape of personalized healthcare. This chapter outlines the components and the ideal requirements for usability, such as flexibility, comfort, and biocompatibility. They are employed in diverse applications such as chronic disease management, including diabetes, respiratory conditions, neurological disorders, cancer detection, infectious disease tracking, and stress monitoring. These sensors support early diagnosis, continuous monitoring, and personalized treatment strategies. The integration of artificial intelligence enhances data interpretation, enabling predictive insights and real-time alerts. However, with increased data collection comes the need for strong privacy and security protections. Wearable biosensors hold significant promise in reshaping healthcare by enabling proactive, data-driven decision-making and improving health outcomes through continuous and personalized monitoring, which has been highlighted in this chapter.