GitHub Copilot is an AI-powered code completion tool developed by GitHub in collaboration with OpenAI. It analyzes code patterns from millions of public code repositories on GitHub to provide contextual code suggestions and auto-completion to help developers write code more efficiently and accurately. GitHub Copilot can enhance productivity by offering code efficiency and speed, promoting code quality and consistency, facilitating learning and skill development, assisting with prototyping and experimentation, and enabling collaborative coding and knowledge sharing among teams. Developers should use Copilot responsibly and understand that its suggestions are based on publicly available code patterns.