Stable Diffusion WebUI (AUTOMATIC1111) is an open-source browser interface that exposes Stable Diffusion image-generation and editing features through a powerful Gradio-based GUI. It provides text-to-image, image-to-image, inpainting, batch processing, model/checkpoint management, and many advanced parameters (samplers, CFG scale, steps, seeds, negative prompts) to refine outputs. The project is highly extensible: a large ecosystem of community extensions, scripts, and plugins lets users add new samplers, UIs, post-processing, and integrations; it can run locally on GPU, via Docker images, or in hosted Colab notebooks. Its unique value is the combination of deep configurability, fast iteration for artists and researchers, and a broad community-maintained ecosystem that continuously adds capabilities.