Is it grammatically correct to put a comma before and?

Related questions

1. Do you use a comma with either or?
2. What is the difference between neither/nor and either or?
3. When should you not use an Oxford comma?
4. Does the comma go before or after and?
5. What's the difference between there and their?
6. Is it other then or other than?
7. Do you need a comma before or?
8. Does a comma go before or after because?
9. Does a comma go before where?

Tags

1. #depends
2. #independent
3. #conjunction
4. #answers
5. #correct
6. #whether
7. #situation
8. #always
9. #primary
10. #three
11. #there
12. #clauses
13. #connect
14. #coordinating
15. #conjunctions
16. #comma
17. #before