How do bit ly links work?

Related questions

1. How do I open a bitly link?
2. How do link shorteners work?
3. Can bit ly be a virus?
4. What is Bitly used for?
5. Can you change a bitly link?
6. How do URL shorteners make money?
7. Is Bitly case sensitive?
8. Do bitly links expire?
9. How do I make a bitly link?
10. Are bitly links permanent?

Tags

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2. #technique
3. #redirects
4. #shortened
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19. #click
20. #links