AI code tools use artificial intelligence to assist in writing, debugging, and optimizing code. These tools can provide code suggestions, automate repetitive coding tasks, and improve code quality. Prominent AI code tools include GitHub Copilot for intelligent code completion, Tabnine for multi-language code suggestions, OpenAI Codex for advanced code generation, and Replit Ghostwriter for collaborative coding. These tools are invaluable for developers, helping them to write efficient and error-free code more quickly.