+A **cost function** quantifies a [Machine Learning](/wiki/machine_learning) model's error, revealing how far its predictions stray from reality. Minimizing this value guides the model's [Optimization](/wiki/optimization), refining its internal settings for improved learning.
+## See also
+- [Gradient Descent](/wiki/gradient_descent)
+- [Loss Function](/wiki/loss_function)
+- [Parameters](/wiki/parameters)
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