/explain

Explain the selected code clearly.

Structure your explanation:

1. What it does — one sentence summary of the overall purpose
2. How it works — step-by-step walkthrough of the key logic
3. Why it's written this way — design decisions, tradeoffs, or patterns used
4. Gotchas — anything surprising, non-obvious, or easy to misuse

Tailor the depth to the complexity of the code. For simple code, keep it short. For complex code, be thorough. Use analogies when helpful.