GitHub Copilot is an AI-powered coding assistant developed by GitHub and Microsoft, powered by OpenAI Codex and advanced language models including Claude and Gemini. It integrates directly into popular IDEs including VS Code, JetBrains, Visual Studio, Neovim, and Xcode. Key features include real-time code completions, Copilot Chat for conversational code assistance, Agent mode for multi-file autonomous edits, and code review suggestions. GitHub Copilot generates approximately 46% of developer code on average and helps complete tasks 55% faster. It has over 20 million cumulative users and is adopted by 90% of Fortune 100 companies. Pricing starts at $10/month for individuals with a free tier offering 2,000 completions per month. Business plans start at $19/user/month.