What is a SVG file?
SVG (Scalable Vector Graphics) describes images as maths rather than pixels, so they stay razor-sharp at any size. It is ideal for logos and icons, but not for photographs - converting SVG to a raster format like PNG or JPG makes it usable anywhere.
How to open a SVG file
SVG opens in any web browser and vector editors like Illustrator or Inkscape; to use it as an ordinary picture, convert it to PNG or JPG.