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RIS stands for Reverse Image Search and is a common online tool -initially made famous by google re: their 'search google by image' option. theoretically, the r.i.s. tool allows anyone to search the entire web, i.e., google, by a photo (jpeg, .img, etc.) All the user has to do is right click any photo in their browser, select RIS, and chrome will perform a search using that specific image file - a stark contrast to the traditional option, text.
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