Why is CPU called the brain of the computer?

Related questions

1. What happens when CPU usage 100?
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6. Do you need a good CPU for gaming?
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Tags

1. #transistors
2. #computer
3. #processing
4. #think
5. #brain
6. #millions
7. #perform
8. #manipulate
9. #called
10. #calculations
11. #maker
12. #necessary
13. #decision
14. #central
15. #containing
16. #microprocessor