The Stable Diffusion WebUI, usually called AUTOMATIC1111 after its author, is the browser-based interface that made local image generation approachable. It offers text-to-image, image-to-image, inpainting, upscaling and a large extension ecosystem behind a conventional form interface rather than a node graph. It remains the most widely documented starting point for running Stable Diffusion locally, which means most tutorials and troubleshooting answers assume it.
Pricing: Free