Is Borderlands 2 online co op?

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Tags

1. #simple
2. #session
3. #local
4. #enemy
5. #story
6. #technical
7. #starting
8. #built
9. #borderlands
10. #details
11. #predecessor
12. #scaling
13. #cooperative
14. #online
15. #leveling
16. #specifically
17. #progression