CodiumAI is a product that offers AI code generation to help developers write, test, and review code. It includes features such as generating quality code and meaningful tests inside the IDE, making pull requests less painful, automating development tasks, and ensuring code integrity. The product is available as an IDE plugin, a Git plugin, and a CLI tool. It supports various programming languages and is free for individual developers. CodiumAI emphasizes code integrity and provides security measures to protect user data.