Rendering is the process of generating a 2D image or animation from a 3D model using computer software. It involves calculating how light interacts with the model's surfaces, textures, and materials to create realistic or stylized visuals. Rendering takes into account various factors like lighting, shadows, reflections, and camera angles. The quality of the render can vary depending on the settings, such as resolution and level of detail, as well as the complexity of the model.