Stable Diffusion is the open-source alternative to proprietary AI image generators. Developed by Stability AI, it can be run on your own hardware, giving you complete control over the generation process without censorship or usage limits. The model excels at creating realistic images, artistic styles, and detailed compositions from text prompts. Because it's open-source, a massive community has built custom models, fine-tunes, and interfaces around it. You can use it through web UIs like AUTOMATIC1111 or Invoke AI, or via cloud services like DreamStudio. The learning curve is steeper than consumer-focused tools, but the flexibility, privacy, and unlimited generation make it powerful for serious creators.