RAG Frameworks Frameworks for building retrieval-augmented generation applications. Comparison | Framework | Best For | Learning Curve | Flexibility | |-----------|----------|----------------|-------------| | LangChain | Agents, chains, tools | Steeper | Highest | | LlamaIndex | Data indexing, simple RAG | Gentle | Medium | | Sentence Transformers | Custom embeddings | Low | High | --- LangChain Orchestration framework for building complex LLM applications. Core concepts: - Chains : Sequential operations (retrieve → prompt → generate) - Agents : LLM decides which tools to use - LCEL : Declara…