What is Hadoop in simple terms?

Related questions

1. How Hadoop is better than Rdbms?
2. Is Hadoop a good career?
3. Is Hadoop a Rdbms?
4. Does Hadoop require coding?
5. When use Hadoop vs SQL?
6. Should I learn Hadoop or python?
7. Is Hadoop grid computing?
8. How can we use Hadoop?
9. Is Hadoop useful?
10. Which is better Hadoop or python?

Tags

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2. #clusters
3. #local
4. #software
5. #using
6. #computation
7. #across
8. #thousands
9. #programming
10. #library
11. #servers
12. #hadoop
13. #single
14. #processing
15. #designed
16. #simple
17. #storage
18. #allows
19. #scale
20. #distributed
21. #models
22. #apache
23. #offering
24. #large
25. #machines
26. #computers
27. #answered