Why computer can understand only 0 and 1?

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1. #mathematics
2. #system
3. #internally
4. #implementation
5. #devices
6. #gates
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8. #circuitry
9. #electronic
10. #computer
11. #straightforward
12. #computers
13. #binary
14. #referred
15. #digit
16. #logic
17. #number
18. #based
19. #almost
20. #digital
21. #modern
22. #because