The dimensions of 5x7 in inches is a***d trade-off between portability and visibility. The size makes a meaningful photo more prominent, but still small enough to be easily framed and stored, as Visuals Clipping explains. It can be used for portraits, graduation photos, family photos, travel photos, and more, which are occasions where a photo should be bigger than a small picture. It is also a viable choice for gifts, as many styles of frames are available that are compatible.