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What are ensemble methods (bagging, boosting, stacking, blending), and why do ensembles work?

Ensembles win Kaggle and quietly power most production tabular models. The signal is explaining why combining models beats one (error decorrelation), and knowing exactly how the four techniques differ in what they fix.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

Ensembles win Kaggle and quietly power most production tabular models. The signal is explaining why combining models beats one (error decorrelation), and knowing exactly how the four techniques differ in what they fix.

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