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Retrieval-Augmented Generation
(RAG)
Concept, Architecture, and
Applications
What is RAG?
• RAG stands for Retrieval-Augmented
Generation
• Combines information retrieval with LLM
generation
• Enhances answers using external knowledge
• Common in AI chatbots and assistants
Why RAG is Needed
• LLMs have limited or outdated knowledge
• Reduces hallucinations
• Provides domain-specific answers
• Uses real-time or private data
RAG Architecture
• User query is received
• Relevant documents are retrieved
• Context is sent to LLM
• LLM generates final answer
Key Components
• Document storage
• Embedding model
• Vector database (FAISS, etc.)
• Large Language Model
Workflow Steps
• Convert documents into embeddings
• Store embeddings in vector DB
• Retrieve relevant context for query
• Generate answer using LLM
Advantages of RAG
• Improves answer accuracy
• Supports private data usage
• Reduces hallucination
• Scalable knowledge updates
Applications of RAG
• Customer support chatbots
• Medical assistants
• Enterprise knowledge search
• Education assistants
Tools Used in RAG
• LangChain / LlamaIndex
• FAISS / Pinecone
• Hugging Face models
• Open-source LLMs
Conclusion
• RAG combines retrieval + generation
• Improves reliability of AI systems
• Widely used in modern AI apps
• Key technology for enterprise AI