Professional photographers capture moments using cameras and other equipment. They often take pictures of people, but they also photograph outdoor locations, artwork, animals, and a wide range of other subjects. Photographers may take pictures for their own use, or they may be hired by individuals, groups, or companies. Before the photo shoot, professional photographers offer advice about locations, settings, and poses based on their expertise. Standard tools used by a photographer include a camera, tripod, different types of camera lenses, photo editing software, and backdrops. Professional photographers may work independently on a contract basis, or they may work for a company or agency as a staff photographer.