What is secret conversation in Facebook Messenger?

Related questions

1. Why can't I see my messages on messenger?
2. Is Facebook connected to Messenger?
3. How do you know if someone is on messenger?
4. How can you tell if someone is on Facebook Messenger?
5. Can someone tell if you block them on messenger?
6. How do secret conversations work on messenger?
7. Do Facebook Messenger texts show up on phone bill?
8. How do you tell if someone is online on Facebook that is not your friend?
9. How can I read my facebook messages without them knowing?
10. Is Facebook and Messenger the same thing?

Tags

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2. #means
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8. #conversation
9. #messenger
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11. #secret
12. #messages
13. #intended
14. #encrypted
15. #regular
16. #including
17. #different