Every digital photo has some extended information, like ImageDescription, Model, Orientation, Copyright, Flash, ExposureTime, UserComment. These parameters of the photo are just the ones EXIF Viewer deals with. The utility helps you to sort, move or copy photos by this photo metadata. Print the list of only those photos that were horizontally made. Or select those with certain exposure. Or you may want to create a .xls or .htm report where every photo is supplied with extended information (EXIF).