Surface-emitting lasers is a category of semiconductor laser devices engineered to emit coherent light perpendicular to the surface of the wafer or substrate, as opposed to edge-emitting lasers that release light parallel to the surface. This concept encompasses the study, design, and fabrication of these structures, which often incorporate vertical resonant cavities and distributed Bragg reflectors, investigating characteristics such as low threshold current, high efficiency, wavelength tunability, and suitability for high-density array integration. The significance of this research area lies in enabling compact, high-performance light sources critical for advanced photonic applications including high-speed optical interconnects, 3D sensing, and display technologies.