Why do we use Gecko driver?

Related questions

1. What is WebDriver in terms of Java?
2. What is WebDriver class in selenium?
3. What is WebDriver a class or interface?
4. What is the difference between absolute and relative XPath?
5. Which driver is used for Firefox automation?
6. What is selenium eclipse?
7. What is GeckoDriver log?
8. Why is GeckoDriver needed?
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Tags

1. #acting
2. #between
3. #starting
4. #using
5. #driver
6. #marionette
7. #proxy
8. #tests
9. #webdriver
10. #before
11. #automation
12. #implements
13. #executable
14. #translates
15. #calls
16. #local
17. #geckodriver
18. #protocol
19. #browser
20. #gecko
21. #called
22. #remote
23. #firefox
24. #system