Is heroku a PaaS or IaaS?

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Tags

1. #service
2. #cloud
3. #offers
4. #where
5. #operations
6. #short
7. #example
8. #handles
9. #computing
10. #virtualized
11. #provider
12. #heroku
13. #resources
14. #internet
15. #platform
16. #infrastrcuture
17. #infrastructure
18. #provided