This chapter is concerned with the basics of real-time rendering, namely the graphics rendering pipeline, graphics representation and illumination model. The terms graphics pipeline or rendering pipeline mostly refer to state-of-the-art methods of rasterization-based rendering, supported by commodity graphics hardware. Its main function is to synthesize or to render 2D raster images with given 3D scene information including scene geometry, virtual camera, lights, material as well as different types of texture, etc.