Stable Diffusion is a generative AI model that can create images from text prompts, modify images based on text prompts, or enhance low-resolution or low-detail images. It is an open-source model developed by Stability AI and its research partners. It uses a latent diffusion process and a text encoder called OpenCLIP to produce high-quality and coherent images. It can generate images with various resolutions and styles, and can also use depth information to preserve the structure of the input images. It is trained on billions of images from the LAION-5B dataset and other sources. It is widely used for creative and artistic applications and powers many popular apps and tools.