The plain-English version
Learning details of the training examples that do not transfer well to new examples.
Why it matters
A low training error can coexist with poor real-world usefulness.
Let’s make it click
An increasingly complex predictor memorizes rare patterns in a small training table.
Vibe Bro’s heads-up
Adding more complexity to improve the training score can worsen generalization; compare held-out behavior and simpler baselines.
The docs behind it
Documentation links checked .
Editorial review · October 28, 2026
Supported: Overfitting and the distinction between training fit and generalization are correctly stated.