+A **test set** is a vital, unseen portion of [Data](/wiki/data), held separate to impartially gauge the performance of a [Machine Learning](/wiki/machine_learning) model. It serves as the ultimate, independent examination, revealing how well the model generalizes to new, real-world examples. Its integrity is crucial for an honest evaluation of a predictive algorithm's true capabilities.
+## See also
+- [Training Set](/wiki/training_set)
+- [Validation Set](/wiki/validation_set)
+- [Model](/wiki/model)
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