Photography involves using a camera lens to take pictures by focusing light onto light-sensitive surfaces inside the camera during an exposure. This creates an electronic image that is stored digitally. The photography industry employs over 43,000 people in the UK, mostly in London and the southeast of England. It is composed of many small businesses and companies that produce images, sell photography equipment and supplies, operate picture libraries, manufacture cameras and lenses, and provide support services. Major companies in the industry include Getty Images, SnappySnaps, and Fujifilm.