Two different answers, because there are two different questions
PNG to SVG is really two jobs wearing the same name, and every converter that offers only one of them gets half its visitors wrong. This page asks you which one you have, right above the drop area.
Exact copy keeps your picture exactly as it is. The original file travels inside the SVG untouched, so what comes out is pixel for pixel what went in: same colours, same detail, same transparency, nothing approximated. Pick this when a form or a piece of software insists on a file ending in .svg and you have a photograph, a screenshot or a detailed graphic. Be clear about what it is: the file is a valid SVG that every browser and editor will open, but the picture inside it is still made of pixels, so enlarging it enlarges the pixels.
Traced shapes is a genuine conversion from pixels to geometry. The image is reduced to a palette of flat colours, the boundary of each colour region is followed to produce an outline, those outlines are simplified, and the result is written as real path data with real coordinates. Scale it to a billboard and the edges stay perfectly crisp, because they are described as shapes rather than stored as dots.