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Explain PCA (Principal Component Analysis). When and how do you use it?
ML Concept: 5-7 minutes to answer
dimensionality-reductionfeature-engineeringunsupervisedcategory:ml_frameworks
Updated Jan 18, 2026
Question
Question
Explain PCA (Principal Component Analysis). When and how do you use it?
Expected time to answer: 5-7 minutes
Difficulty: intermediate
Why This Is Asked: Tests understanding of dimensionality reduction for feature engineering
Tags: dimensionality-reduction feature-engineering unsupervised
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python
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