Thumbnail is a term used by graphic designers and photographers for a small image representation of a larger image, usually intended to make it easier and faster to look at or manage a group of larger images. For example, software that lets you manage a number of images often provides a miniaturized version of each image so that you don't have to remember the file name of each image. A thumbnail is also used to mean a small and approximate version of an image or a brochure layout as a preliminary design step. Adobe's Acrobat viewer lets you show a sequence of thumbnails of viewable pages as a way to navigate among the pages in a document. Adobe's Photoshop lets you view a thumbnail version of certain kinds of images.