Stable Diffusion XL (SDXL) is a generative adversarial network (GAN) model that can generate expressive images with shorter prompts and insert text into images. It is an improved version of the Stable Diffusion model developed by Stability AI, resulting in higher quality and more controllable image generation, and supporting localized image editing with natural language. This model can be used for various creative design tasks, such as concept art, graphic design, video effects, and more.