Why WebDriver is an interface in selenium?

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Tags

1. #browser
2. #follow
3. #interfaces
4. #firefoxdriver
5. #interface
6. #selenium
7. #implementation
8. #constants
9. #contract
10. #serves
11. #methods
12. #collection
13. #chromedriver
14. #webdriver
15. #abstract
16. #specific
17. #provided
18. #without