SVG — the SVG format — is completely separate from JPG. JPG encodes pictures as a raster of pixels, SVG encodes graphics as mathematical definitions of geometric shapes. Which means SVG files can be displayed at every size — from a tiny icon to a large banner — without any loss of sharpness.
Transforming JPG to SVG is a technique known as image vectorization, and it is very beneficial for logos and simple graphics.
Before converting JPG to SVG, it is necessary to understand what happens. JPG files are a raster image — a set grid of image pixels. An SVG is a vector image — a set of mathematical instructions that applications renders as the image.
This works extremely well for uncomplicated graphics with defined shapes and limited colors — icons, more info logos, symbols and line art. It works less well for detailed photographs with fine detail.
For best output, Illustrator's Image Trace function provides the most flexibility. Open your JPG in Illustrator, highlight the image, access the Image Trace settings and pick an suitable option.
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