Dive into the essential world of Large Language Model (LLM) architectures. This comprehensive tutorial breaks down three pivotal approaches shaping enterprise AI: Model Context Protocol (MCP) for direct, real-time data access, Agentic AI for complex, multi-step task coordination, and Retrieval Augmented Generation (RAG) for leveraging vast knowledge bases via embeddings. Uncover their unique flows, core advantages, and critical challenges. Discover why the future of AI isn’t ‘one size fits all’ but a strategic blend of these powerful methods.