# Day 5 of learning AI Engineering: built a small RAG app over a PDF (opens in new tab)

I built a small RAG (Retrieval Augmented Generation) project where a user can ask questions from a PDF, and the LLM answers from that PDF along with the page number to look at. The stack is LangChain, OpenAI embeddings, and Qdrant running in Docker. A small note before we start: this exact same pipeline is what powers web-apps like an "AI Tutor in Educative", an "AI web page builder". The only thing that changes between those products and my PDF Q&A is the data source. That is the key idea to...