Lightning AI provides a complete environment for building, training, and deploying AI models directly from a web browser. Created by the makers of PyTorch Lightning, the platform combines notebook interfaces, model serving, and collaboration tools. Developers can prototype with GPU acceleration, version control experiments, and share results - all without local setup. The service is ideal for education, hackathons, and distributed teams needing instant access to consistent environments. Unique features include real-time collaboration, template projects, and seamless transitions from experimentation to production deployment.