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What actually makes a random forest work, beyond 'it averages a bunch of trees'?

Anyone can say 'ensemble of trees'. The real answer is about decorrelating those trees and why that, not just averaging, is what drops variance. Here is what makes the forest more than the sum of its trees.

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

Anyone can say 'ensemble of trees'. The real answer is about decorrelating those trees and why that, not just averaging, is what drops variance. Here is what makes the forest more than the sum of its trees.

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