What does echo do in Linux?

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1. #telling
2. #program
3. #operating
4. #linux
5. #arguments
6. #computer
7. #writes
8. #display
9. #standard
10. #other
11. #output
12. #instruction
13. #built
14. #systems
15. #command
16. #something
17. #interface
18. #shells
19. #provides
20. #shell