Types of Machine Learning Algorithms You MUST Know in 2025! From predicting stock prices to generating AI images, every ML model fits into a category. Master these and you master Data Science. Supervised Learning • Regression: price prediction • Classification: spam detection • Sequence Prediction: stock forecasting Unsupervised Learning • Clustering: customer segments • Dimensionality Reduction: PCA • Anomaly Detection: fraud detection Semi-Supervised Learning • Few labeled many unlabeled data: