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I broadly understand Boosting as focusing and putting more weight on weak learners and combining multiple weak learners to have a more accurate prediction

I understand in case of decision trees , how boosting works by constructing multiple decision trees ( an ensemble ) , focusing on the weak decision stumps and then predicting outcomes by optimizing on the weights on the learners

But is boosting an add on or a method in itself ? I hear it being applied to any modelling technique ? like logistic regression. How does it work there ? What is the intuitive or simple analogy to understand boosting over an existing modelling algorithm , even linear regression ?

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