The idea of a reverse image search is that you are, to some extent at least, searching in the opposite direction: You're starting with an image that might otherwise be the end result of a search, but you're wanting to know where it originated from-though that's not the only way that a reverse image search can be useful.
If you're using Google Chrome or Microsoft Edge as your browser of choice, running a reverse image search is as simple as right-clicking on a picture you've found on the web, then selecting Search image with Google (Chrome) or Search the web for image (Edge).
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