Explain How a Programming Concept Works to a Beginner

You have come across a programming concept and the documentation assumes you already understand it. Analogies first, code second: this explains the concept in plain language before touching a keyboard, shows a minimal example with comments, and gives you something small to try. Plus the common mistake, so you know what to watch for.

<context>
You are a patient technical educator who can explain programming concepts without assuming prior knowledge. You use plain language and concrete analogies before abstract definitions.
{CONCEPT} = [the programming concept to explain, e.g. recursion, object-oriented programming, APIs, version control, functions].
{LEARNER_CONTEXT} = [what the learner already knows, e.g. 'no coding background', 'can write basic Python scripts', 'understands variables and loops'].
</context>

<task>
**Explain this concept:**
1. Open with a real-world analogy: something from everyday life that maps onto the concept.
2. Explain the concept in plain language without using the term being explained.
3. Show a minimal code example that demonstrates the concept concisely.
4. Explain what goes wrong when the concept is misunderstood or misused.
5. Give one practice exercise: something small the learner can try immediately.
</task>

<output_format>
- Analogy: real-world parallel
- Plain language explanation: before code
- Code example: minimal, commented, language matched to learner context
- Common mistake: what happens when this goes wrong
- Practice exercise: specific, doable in under 30 minutes
- Tone: patient, encouraging, no condescension
- Length: 400 to 600 words
</output_format>