juniorRecommendation Systems
What is a recommendation system?
Updated May 16, 2026
Short answer
A recommendation system suggests relevant items to users based on behavior, preferences, or item similarity.
Deep explanation
Recommendation systems analyze user-item interactions, metadata, or both to predict what a user is likely to engage with. They are widely used in e-commerce, streaming platforms, and social media to improve engagement and retention. The core idea is to reduce information overload by ranking items by relevance.
Real-world example
Netflix suggesting movies based on viewing history.
Common mistakes
- Thinking recommendation systems only use user ratings.
Follow-up questions
- What are main types of recommendation systems?
- Where are recommendation systems used?