Model is not complex enough to match all the available data and performs poorly with the training dataset $\Rightarrow$ .bold[Underfitting:] model is unable to match the input data to the target data
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Highly complex models matching almost all the given data points and perform well in training datasets, .bold[but]: model cannot generalize the data point in the test data set to predict the outcome accurately $\Rightarrow$ .bold[Overfitting:] model tries to match non-existent data
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