Flow Cytometry is a laboratory technique used to analyze the physical and chemical characteristics of cells or particles in a fluid. It works by passing a stream of cells through a laser beam, which measures various properties such as size, complexity, and fluorescence. This allows researchers to identify and sort different types of cells based on specific markers. The technique is widely used in fields like immunology, cancer research, and clinical diagnostics. By using fluorescent dyes that bind to specific cellular components, scientists can gain insights into cell health, function, and population dynamics, making it a powerful tool for both research and medical applications.