+Immutable data, once formed, remains unchangeable for its lifetime. This fixed state brings predictability and simplifies [Concurrent Programming](/wiki/concurrent_programming), as no external action can modify it after creation. It stands in contrast to [Mutable Data](/wiki/mutable_data), which can be altered.
+## See also
+- [Functional Programming](/wiki/functional_programming)
+- [Pure Function](/wiki/pure_function)
+- [Side Effect](/wiki/side_effect)
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