Fluorescence-activated cell sorting (FACS) is a specialized laboratory technique used to separate and analyze cells based on their fluorescent properties. In this process, cells are labeled with fluorescent dyes that bind to specific cell markers. As the cells pass through a laser beam, the emitted fluorescence is detected, allowing for the identification of different cell types. Once identified, FACS can sort the cells into different containers based on their characteristics. This technique is widely used in research and clinical applications, including immunology, cancer research, and stem cell studies, enabling scientists to study specific cell populations in detail.