Photonics is the technology of generating and harnessing light and other forms of radiant energy whose quantum unit is the photon. The science includes light emission, transmission, deflection, amplification and detection by optical components and instruments, lasers and other light sources, fibre optics, electro-optical instrumentation, related hardware and electronics, and sophisticated systems. The range of applications of photonics extends from energy generation to detection to communications and information processing.Photonics is the science and technology of generating, controlling, and detecting photons, particularly in the visible light and near infra-red spectrum. Photonics as a science is closely related to quantum optics and optoelectronics with somewhat unclear boundaries. "Quantum optics" often means fundamental research, and "photonics" often means more application-related research. Scientists, engineers and technicians with training in phtotonics and related technologies are in high demand. There is and will continue to be a big global demand for skilled people with photonics training. This leads to exciting, rewarding and highly paid careers.