Underfitting occurs when a model fails to capture the complexity of the training data and thus is a poor representation of the relationship between the features and the target.
Difference Between Overfitting & Underfitting in Machine Learning
Machine Learning with Python Video 16 underfitting and overfitting
Understanding Overfitting and Underfitting in Decision Trees, by Gunjan Gohain
Overfitting And Underfitting In Deep Learning
What is overfitting and underfitting? How can you reduce each of these? - Quora
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Cracking the Code on Underfitting in Machine Learning
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How to Handle Overfitting and Underfitting in Machine Learning, by Vinita Silaparasetty
What is Overfitting in Deep Learning [+10 Ways to Avoid It]