This example demonstrates the fundamental structure of SVG shapes within an HTML page. It displays four circles of equal radius, positioned at different coordinates, with only one explicitly colored red via the `fill` attribute. The code uses raw SVG elements—`<svg>`, `<circle>`—and defines the drawing area with `width` and `height` attributes. No external libraries or JavaScript are employed; rendering relies entirely on native browser SVG support, making it a minimal introduction to static vector graphics.