Are decision trees supervised or unsupervised?

Related questions

1. Can decision trees be used for unsupervised learning?
2. Which of the following is unsupervised machine learning?
3. What is divisive clustering?
4. What is clustering techniques in data mining?

Tags

1. #decision
2. #unsupervised
3. #where
4. #variable
5. #easily
6. #definition
7. #trees
8. #learning
9. #supervised
10. #clustering
11. #handle
12. #datasets
13. #unbalanced
14. #target
15. #algorithm