What is Android open source?

Related questions

1. Is Android fully open source?
2. Is Android better than iOS now?
3. What is best android or iOS?
4. Is Android more popular than iOS?
5. What's a custom ROM?
6. How can I flash my dead android phone?
7. Are custom ROMs safe?
8. Does installing custom ROM delete everything?
9. Is Linux really better than Windows?
10. What Aosp extended?

Tags

1. #linux
2. #known
3. #kernel
4. #modified
5. #touchscreen
6. #designed
7. #smartphones
8. #mobile
9. #tablets
10. #version
11. #license
12. #other
13. #devices
14. #project
15. #licensed
16. #android
17. #under
18. #software
19. #based
20. #primarily
21. #source
22. #apache