What is feature importance in random forest?

Related questions

1. What is random forest in simple terms?
2. What is F score in feature importance?
3. What is permutation importance?
4. How does random forest achieve feature importance?
5. What is the importance of a variable?
6. What is a strong learner?
7. Why is correlation important in machine learning?
8. Does random forest need feature selection?
9. How do you determine variable importance?
10. Why is feature selection important?

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17. #robustness
18. #selection
19. #forest
20. #impurity