What is crawling in Google?

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Tags

1. #googlebot
2. #crawl
3. #fetching
4. #spider
5. #called
6. #robot
7. #crawling
8. #computers
9. #discovers
10. #program
11. #fetch
12. #process
13. #which
14. #index
15. #google
16. #known
17. #added
18. #pages
19. #billions
20. #updated