**head(n)**: Returns first n rows as list of Row. head() without arg = first row. DataFrame API.
**take(n)**: Same—list of Row. RDD origin. Both are actions.
**Functionally**: Equivalent for DataFrames. Use either for small samples.
**Why Care**: Both bring data to driver. On huge DF, use `limit(n)` in transformation to reduce data before action. Or `df.limit(100).collect()` for sampling.
**Scalability Trade-offs**: head(1000) on 1B rows = driver gets 1000; full scan....
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