Trilinear Filtering is a texture filtering technique used in computer graphics to improve the quality of images rendered on 3D surfaces. It works by blending textures from multiple mipmap levels, which are pre-calculated, downscaled versions of a texture. This helps to create smoother transitions and reduce visual artifacts when textures are viewed at varying distances. The process involves linear interpolation between the nearest mipmap levels and the corresponding texels (texture pixels) in those levels. By averaging these values, Trilinear Filtering enhances the appearance of textures, making them look more realistic, especially in scenes with depth and perspective changes.