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A "SVG wrapper" is sometimes applied to an image in order to scale it as large as possible on a page without distortion. This is not possible using just using HTML because screens can have widely differing aspect ratios.
This does nothing for the cover of a kindle book because Amazon uses just the underlying image and ignores the HTML or SVG coding of the cover page.
Another unrelated use of SVG is to provide images that can scale large or small without becoming pixelated. This is used for things like charts and equations, rather than photographic images.
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