What is SVG? Complete Guide with Examples
SVG (Scalable Vector Graphics) is an XML-based vector image format that describes graphics using mathematical paths, shapes, and transformations rather than pixels. Because SVGs are geometry-based, they render crisply at any size — from a 16px icon to a full-screen display — without quality loss. SVGs support interactivity, animation, CSS styling, and accessibility features, making them ideal for icons, logos, illustrations, and data visualizations on the web.
Use our free SVG Optimizer to experiment with svg (scalable vector graphics).
How Does SVG (Scalable Vector Graphics) Work?
SVG files contain XML markup defining graphic elements: paths (<path>), shapes (<rect>, <circle>, <ellipse>), text (<text>), and groups (<g>). Each element uses mathematical coordinates and attributes. When rendered, the browser rasterizes these descriptions at the display's native resolution, producing sharp output at any zoom level. SVG optimization removes unnecessary metadata, simplifies path coordinates, merges redundant elements, and minimizes the XML to reduce file size by 30-70%.
Key Features
- Resolution independence — pixel-perfect rendering on any screen density from 1x to 4x Retina
- CSS styling and theming — change colors, sizes, and animations via external stylesheets
- DOM accessibility — individual elements targetable by JavaScript for interactivity and animation
- Searchable and selectable text within the image, improving SEO and accessibility
- Tiny file sizes for geometric graphics compared to equivalent raster images
Common Use Cases
Icon Systems
SVG sprites and inline SVGs are the standard for icon systems. They scale perfectly, are colorable via CSS currentColor, support accessibility attributes, and eliminate raster size variants.
Logos and Brand Assets
One SVG logo replaces dozens of raster variants needed for different sizes and screen densities. The logo stays crisp from 16px favicons to billboard displays.
Data Visualization
D3.js and similar libraries generate interactive SVG charts where every element is a DOM node that responds to events, animates, and updates dynamically with data changes.