3D rendering is the transformation of three-dimensionalmodels into two-dimensional images or animations. In Unreal Engine, rendering involves complex calculations of lighting, shadows, textures, and effects to produce realistic visual outputs. This process is essential for creating immersive environments, cinematic sequences, and interactive experiences in games, simulations, and architectural visualization. Unreal Engine's rendering pipeline supports both real-time and offline rendering methods, providing flexibility and high-quality output for various applications.