If you are interested in beginning your own stock photography business you no doubt have wondered about who will actually purchase your photos once you put them onto the internet. The primary clients of stock photo sites are webmasters and professional marketers who continually are on the lookout for unique images to promote their products or sites. Traditional advertising agencies also purchase stock photographs as they are continually searching for photos to fill various marketing needs such as posters, billboards, leaflets and calendars. Incredibly the internet is, in reality, the only marketing resource available for finding photographic images and it serves millions of people all over the world.