Is SDLC waterfall or agile?

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Tags

1. #stage
2. #phases
3. #model
4. #includes
5. #gradual
6. #completely
7. #which
8. #analysis
9. #waterfall
10. #cascade
11. #development
12. #every
13. #moving
14. #testing
15. #through
16. #execution
17. #process
18. #projecting
19. #looks
20. #implementation
21. #realization
22. #support