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Definition: thumbnail

A miniature representation of a page or image that is used to identify a file by its contents. Clicking the thumbnail opens the file. Thumbnails are an option in file managers, such as Windows Explorer, and they are found in photo editing and graphics program to quickly browse multiple images in a folder. In drawing programs and programs that deal with page layouts, thumbnails might be used to rearrange the page order by dragging and dropping them into a different sequence.