Tabnine is an AI-powered code completion tool that emphasizes privacy and customization. It offers on-device models, allowing developers to run the assistant locally without sending code to external servers, which is beneficial for security-conscious teams. Tabnine supports a wide range of programming languages and integrates with various IDEs, including Visual Studio Code, JetBrains, and Vim. Users can fine-tune Tabnine's models to align with their specific coding styles.