"Scalable Vector Graphics (SVG) are XML-based vector images. They’ve been around for a long time now but have seen a real resurgence in use over the past couple of years. There are plenty of reasons to use SVGs today including:
Increased native browser support of SVGs means better consistency and higher fidelity of images.
The relative “lightness” of SVG code in a world where bandwidth and performance matter more than ever.
Another big advantage of using SVGs over standard images is that they can easily be made accessible. Since markup can be added to the SVGs directly, they give individuals who use assistive technologies (ATs), such as screen readers, more information about the images within the image itself."