Optics and photonics are the sciences of light and electromagnetic radiation, from X-rays to the far infrared. They include the emission and transmission of light, and the formation, processing and detection of optical signals. These sciences are very present in our environment. Like electronics, photonics is an enabling science, making a major contribution to the development of many sectors, including transport, the environment, health, telecommunications, defense, IT and multimedia, materials, instrumentation and control and measurement techniques.