Lightning AI is a platform based on PyTorch that allows users to easily train and deploy AI models between local machines and cloud environments. It supports the construction of various popular AI models such as large language models, Transformers, and Stable Diffusion. Key features include support for distributed multi-GPU training, built-in MLOps capabilities, and serverless cloud deployment. It is suitable for AI research teams, companies aiming to rapidly develop AI products, and institutions that have GPU resources.