What does "shading" refer to in 3D modeling?

In 3D modeling, "shading" refers to simulating how light interacts with a model’s surfaces to create realistic visual effects like color, texture, and depth, transforming simple wireframes into lifelike previews before final rendering. Common shading methods include: 1. Flat shading: Applies uniform color/intensity to each polygon, resulting in a blocky, low-poly look. 2. Smooth shading: Blends colors across polygon edges for seamless, curved surfaces, mimicking real-world gradients. Ultimately, shading bridges basic geometry and final renders, helping artists refine surface appearance under different lighting to ensure models look natural and detailed.