By viewing AI through a biological lens, we can better understand how these technologies shift.

1. The Brain (LLM) — This is the core intelligence. It has the logic and reasoning, but its knowledge is "frozen" at the time of its training.

2. The Books (RAG) — Ever notice AI sometimes makes things up? It gives the brain a library of your specific files to look up so it stays grounded in facts.

3. The Hands (Agents) — Agents are the hands. They let the AI click buttons, send emails, and finish a task.

4. The Nervous System (MCP) — The wiring. Model Context Protocol is the standard that connects the brain to the books and hands, ensuring everything stays in sync.