Is Sentiment analysis supervised or unsupervised?

Related questions

1. Is Sentiment analysis part of NLP?
2. Is AI a sentiment analysis?
3. What is NLTK in machine learning?
4. What is Sentiwordnet?
5. What is the best algorithm for sentiment analysis?
6. Can we consider sentiment classification as a text classification problem yes or no?
7. How does sentiment analysis work?
8. How do you do sentiment analysis?
9. What does sentiment analysis involve?
10. Why do we do sentiment analysis?

Tags

1. #sentiment
2. #information
3. #opinion
4. #known
5. #subjective
6. #language
7. #extract
8. #analysis
9. #materials
10. #mining
11. #identify
12. #analyses
13. #computational
14. #linguistics
15. #processing
16. #either
17. #refers
18. #learning
19. #unsupervised
20. #source
21. #sentence
22. #supervised
23. #level
24. #based
25. #natural