Dify is an AI-native application development and operation platform that allows users to create and deploy AI-powered apps based on models like GPT-4. It offers an easy-to-use interface for developing applications, supports various AI models, and provides compatibility with ChatGPT plugins. Dify also allows users to use their own data as context for AI, automates text preprocessing and vectorization, and offers a range of application types and templates. It provides a visual composition feature, a set of APIs for integration, and continuous improvement and operation capabilities for AI applications.