Spline is a web-based 3D design and animation tool that allows designers to create interactive 3D scenes without coding. You design 3D models, apply materials and lighting, add animations, and create interactions—all in a visual interface. Spline exports to web-ready formats (WebGL/HTML) that can be embedded in websites or built as standalone experiences. Spline is democratizing 3D web design, making professional 3D possible for designers without 3D expertise or game development background.