What is homebrew for Nintendo?

Related questions

1. Can you buy GBA games on 3ds?
2. What is the role of firmware?
3. Can you play 3ds games on a DS?
4. Is Wii U Homebrew safe?
5. What is legit CIA?
6. Is Homebrew safe?
7. Is CFW illegal?
8. What are examples of firmware?
9. Can I play online with hacked 3ds?
10. Will Nintendo DS play GameBoy games?

Tags

1. #homebrew
2. #through
3. #games
4. #nintendo
5. #includes
6. #scale
7. #licensed
8. #balance
9. #things
10. #sanctioned
11. #board
12. #applications
13. #refers
14. #software
15. #engines
16. #ability
17. #homemade