What is the difference between signed and unsigned APK?

Related questions

1. Why some apps are not compatible with my device?
2. Why I Cannot install apps in Play store?
3. Why GB WhatsApp is temporarily banned?
4. Why apps are not downloading in my phone?
5. Why can't I install apps on my iPhone?
6. Why WhatsApp is not downloading on my iPhone?
7. Why are my apps not downloading on my Android?
8. Is there any problems with WhatsApp?
9. Why my app is not working?
10. What is signed APK in Android?

Tags

1. #store
2. #using
3. #holds
4. #unsigned
5. #developer
6. #export
7. #binary
8. #means
9. #contains
10. #installed
11. #google
12. #certificate
13. #private
14. #keystore
15. #signed