Biological sensing is a research area that focuses on developing technology to detect and measure biological molecules, organisms, or processes. This can include detecting pathogens in food or water, monitoring changes in the body's biological markers for disease diagnosis, or measuring environmental changes through biological indicators. Biological sensors can use a variety of methods, such as optical, electrochemical, or biological receptors, to detect specific analytes. This area of research has wide-ranging applications in healthcare, environmental monitoring, and food safety.