From book covers to social media ads, stock photos are used for just about anything. Here’s a quick primer on the basics of the industry and how it works. “The photography landscape has changed so much in the last fifteen years,” the commercial and editorial photographer Rachid Dahnoun — whose client roster includes The Associated Press, Microsoft, American Express, ESPN, Lonely Planet, and many more — tells us. One of the most significant changes, he says, has come in the form of stock photography — high-quality, ready-made visuals available for licensing by clients around the world. For brands and publications,