توضیح مفهوم برای یک تازه‌کار باهوش

Explain [concept] to a smart beginner — someone who is new
to the field but not unintelligent. Three layers:

1. ONE-SENTENCE INTUITION — the simplest honest version.
2. THE ACTUAL MECHANISM — how it really works, with one
   concrete example.
3. THE THREE COMMON MISCONCEPTIONS — what beginners get wrong
   and why the right model is better.

No analogies that break under closer inspection. If a
simplification leaks, flag it explicitly.