Please note that the content of this book mainly consists of articles that are available for free online from Wikipedia or other sources. Adobe Photoshop Lightroom is software for managing, optimizing, and converting digital photos, including RAW data generated by digital single-lens reflex cameras (DSLRs), among others. Lightroom is available for the Mac OS X and Microsoft Windows operating systems (from XP onwards). The software is primarily aimed at professional photographers and dedicated amateurs, providing them with tools for extensive workflows, ranging from managing large image file collections and editing them to presenting them on screens, printers, and the internet.