What is the point of port forwarding?

Related questions

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2. Should Port Forwarding be enabled?
3. Is port forwarding dangerous?
4. What's a double NAT?
5. What is the benefit of port forwarding?
6. What is Port Triggering vs Port Forwarding?
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Tags

1. #forwarded
2. #numbers
3. #forwarding
4. #incoming
5. #router
6. #connections
7. #possibly
8. #depending
9. #internal
10. #allows
11. #number
12. #range
13. #combination
14. #address
15. #matching
16. #enter
17. #computer