Following are the core features of SVG:
SVG, Scalable Vector Graphics is an XML based language to define vector based graphics.
SVG is intended to display images over the web.
Being vector images, SVG image never loses quality no matter how they are zoomed out or resized.
SVG images supports interactivity and animation.
SVG is a W3C standard.
Others image formats like raster images can also be clubbed with SVG images. SVG integrates well with XSLT and DOM of HTML.