Stable Diffusion Web UI is a web interface based on the Stable Diffusion model, implemented using the Gradio library. It offers various image generation features, including txt2img and img2img modes, one-click installation, and running scripts, as well as advanced image processing options like Outpainting, Inpainting, and Color Sketch. It supports multiple hardware platforms, including NVidia, AMD, Intel, and Ascend NPUs, and provides detailed installation and operation guidelines.