Lightning AI is a full-stack AI development platform built around PyTorch Lightning, an open-source framework that abstracts away boilerplate training code while retaining full flexibility of PyTorch. The platform provides managed cloud infrastructure for running AI workloads, including multi-GPU and multi-node distributed training, experiment tracking, and model serving. Developers can build and run Lightning Apps — modular, cloud-native workflows — that connect data pipelines, training jobs, and inference endpoints. The ecosystem supports integration with popular MLOps tools and enables reproducible, scalable AI development from a unified interface.