Diffusers is the Hugging Face library for diffusion-based image generation (and other modalities). You use it to run Stable Diffusion models: load a model checkpoint, provide a text prompt, generate images. It abstracts away model details and provides high-level APIs. Advanced usage: LoRA fine-tuning (adapt models to custom styles), ControlNet (condition generation on additional inputs), optimization (memory efficiency, speed). Production deployments of Diffusers serve thousands of image generation requests.