Polaritons are quasiparticles that arise from the strong coupling between photons and excitons in semiconductors or other materials. They exhibit unique properties that are a combination of those of light (photons) and matter (excitons), which can be manipulated and controlled for various applications in optics, photonics, and quantum information processing. Research on polaritons focuses on studying their fundamental properties, understanding their interactions with other particles, and exploring their potential for novel technologies such as polariton lasers, quantum simulators, and information processing devices.