Aider is an innovative AI-assisted programming tool designed to help developers efficiently complete programming tasks within their local codebase by integrating with large language models (LLMs). It supports multiple popular programming languages, understands complex requirements, and implements changes directly in the code. Aider's main advantages include efficiency, flexibility, and compatibility with multiple LLMs. It's suitable for developers who want to improve their programming efficiency, whether novice or experienced. Aider is currently free and open to promote the popularization of AI programming.