How does SSH port forwarding work?

Related questions

1. How does SSH work with keys?
2. Is Port Mapping the same as port forwarding?
3. What is the SSH port?
4. Why would you port forward?
5. Can ssh listen on multiple ports?

Tags

1. #client
2. #configured
3. #forward
4. #forwarding
5. #listens
6. #server
7. #receives
8. #tunneling
9. #servers
10. #through
11. #machine
12. #transfers
13. #sessions
14. #tunnels
15. #connections
16. #local
17. #basically
18. #connection