Aider is an AI-assisted pair programming tool optimized for terminal use, enabling developers to modify code in local git repositories with the help of LLMs such as GPT-4 and Claude 3.5 Sonnet. It aids in feature development, bug resolution, code refactoring, and documentation updates. Offering seamless Git integration with concise commit messages and compatibility with multiple programming languages, Aider excels in boosting coding productivity and precision.