This example demonstrates a single red circle rendered using basic SVG shapes, serving as an introduction to SVG fundamentals. The markup defines a `<circle>` element with explicit `cx`, `cy`, and `r` attributes to position and size the shape, while the `fill` property sets its color. The code relies solely on native SVG syntax within an HTML document, with no external JavaScript libraries or data sources. It visually illustrates how geometric primitives are declared and styled directly in markup, providing a minimal starting point for learning vector graphics on the web.