Biosensors and Chemical Sensors are powerful analytical tools used to detect specific biological or chemical substances with high sensitivity and precision. A biosensor typically combines a biological recognition element—such as enzymes, antibodies, or nucleic acids—with a transducer to convert a biological response into a measurable signal. These sensors are widely used in medical diagnostics, environmental monitoring, food safety, and biotechnology. Chemical sensors, on the other hand, detect chemical compounds through physical or chemical interactions and are employed in detecting gases, ions, or molecules. Both types of sensors offer rapid, real-time analysis and can be integrated into portable or wearable devices for on-site monitoring. With ongoing innovations, these sensors continue to play a crucial role in advancing point-of-care testing and improving analytical accuracy in various fields.