Primitive shaders are basic programs used in computer graphics to determine how surfaces appear in 3D environments. They handle the rendering of simple shapes, like triangles and lines, by calculating colors, lighting, and textures. This process is essential for creating realistic images in video games and simulations. These shaders operate on the fundamental building blocks of graphics, known as primitives. By manipulating these primitives, developers can create complex scenes and effects. Primitive shaders are often the first step in the rendering pipeline, setting the stage for more advanced techniques and visual effects in graphics applications.