What We’ll Build Today
A spam classifier that learns from labeled examples (supervised learning)
A customer segmentation system that discovers patterns on its own (unsupervised learning)
A comparison tool that shows when to use each approach in real AI systems
Why This Matters
Every AI system at Netflix, Spotify, Tesla, and Google uses either supervised or unsupervised learning—or both. Netflix’s recommendation engine uses supervised learning to predict what you’ll rate 5 stars based on your past ratings. Spotify uses unsupervised learning to group similar songs into playlists without anyone telling it which songs go together. Understanding this fundamental split is like understanding whether you need a GPS with a known destination (supervised) or an explorer discovering new territories (unsupervised). This single decision determines your entire ML pipeline, data requirements, and what problems you can solve.
