Use SVG for websites, apps, and any digital design requiring scalability. SVG files are resolution-independent and load faster. Use PNG (converted from SVG at 300 DPI) for presentations, printed materials, or software that doesn’t support SVG. Convert using Adobe Illustrator, Inkscape, Affinity Designer, or online tools like CloudConvert. Export at 300 DPI for print, 72-150 DPI for web.