Analog represents information by varying physical qualities, whereas digital stores information as a binary file. For instance, a vinyl record is an analogy file, because it stores sound in a continuous series of bumps and grooves. A CD, on the other hand, stores information in a series of 1s and 0s. Photographs are analog, because they are interpreted and reproduced based on the physical quality of light in the actual photo and its negative. Digital photography is stored on a computer as binary data and can be copies or manipulated in digital form.