What is cluster analysis in data mining?

Related questions

1. How do you find the centroid?
2. What is the centroid of a data set?
3. What is grid based clustering in data mining?
4. Is naive Bayes supervised or unsupervised?
5. What is difference between supervised and unsupervised learning?
6. What is unsupervised learning in machine learning?
7. What is supervised and unsupervised learning in artificial intelligence?

Tags

1. #class
2. #other
3. #objects
4. #advertisements
5. #words
6. #grouped
7. #cluster
8. #belongs
9. #analysis
10. #similar
11. #group
12. #dissimilar
13. #mining
14. #another