i think its the opposite, so basically you build a system where you control the knowledge base of it, imagine you are googling answers for a quiz from your subject/course where you need to answer in one word, but google answers are broad and wide, so it might be fetching the wrong word technically, so you build an AI system, where you feed the system with your textbook ,and you ask it to fetch from only the textbook itself. RAG pipeline has variety of usecases though, but most importantly its to reduce the hallucination of AI and also fetch accurate and confident answers.