ngrok is a connectivity infrastructure tool used by AI systems developers to prototype new ideas, test code, and manage traffic in distributed systems. The AI system built on top of LLMs (Large Language Models) uses ngrok to connect with other services, such as real-time transcription services and question detection services, to enable seamless communication between these components. By using ngrok, developers can develop and test their applications locally without the need for production traffic, making it easier to iterate on prompts and improve question detection in LLM-powered RAG (Role-based Adaptive Guidance) applications.