MegaTexture is a technology used in computer graphics to create highly detailed textures for 3D models. It allows for the application of large, high-resolution images across surfaces, enabling more realistic environments in video games and simulations. This technique helps to reduce the need for multiple smaller textures, streamlining the rendering process. Developed by John Carmack and used in games like Rage, MegaTexture enhances visual fidelity by providing unique textures for each surface, even in expansive landscapes. This innovation allows for greater artistic freedom and immersion, as it can depict intricate details without sacrificing performance.