People who make their living as photographers have a variety of ways they can earn money. Often, a client, either an individual or a company, wants a certain type of photo and so they assign that photo to a professional to take. But, another way photographers can sell photos is by taking an image and allowing that image to be used by others for a multitude of purposes. This is called stock photography. These images for purchase can be bought by more than one individual or company over time. That gives the photographer the chance to earn money numerous times for the same photographic image. It also gives the client a good photo at a lower price point.