+A [Pure Function](/wiki/pure_function) always yields the same output for the same input, with no [Side Effects](/wiki/side_effects). It does not alter any external state, ensuring predictable and reliable behavior, a cornerstone of [Functional Programming](/wiki/functional_programming).
+## See also
+- [Immutability](/wiki/immutability)
+- [Idempotence](/wiki/idempotence)
+- [Higher-Order Function](/wiki/higher_order_function)
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