K-Nearest Neighbors (KNN)

📘 Artificial Intelligence & Machine Learning Basics 👁 88 views 📅 Nov 05, 2025
⏱ Estimated reading time: 1 min

Definition:
A supervised learning algorithm that classifies a data point based on the majority class of its nearest neighbors.

Key Points:

  • Distance-based: Uses Euclidean, Manhattan, or other distance metrics

  • Simple and non-parametric

  • Works for classification and regression

Applications:

  • Handwriting recognition

  • Image classification

  • Recommender systems

Advantages:

  • Simple to implement

  • No training phase required

Limitations:

  • Slower for large datasets

  • Sensitive to irrelevant or noisy features


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