What is backend in keras?

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1. #level
2. #developing
3. #library
4. #models
5. #providing
6. #tensor
7. #blocks
8. #framework
9. #google
10. #manipulation
11. #tensorflow
12. #available
13. #keras
14. #symbolic
15. #theano
16. #model
17. #learning
18. #developed
19. #source
20. #implementations
21. #building
22. #backend