What is firebase and how do you use it?

Related questions

1. Is firebase free to use?
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5. Is firebase good for backend?
6. Is NoSQL a firebase?
7. Is firebase DB free?
8. What is the difference between firebase and firestore?
9. Is firebase good for large database?
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Tags

1. #authentication
2. #server
3. #realtime
4. #backend
5. #create
6. #mobile
7. #database
8. #powerful
9. #without
10. #provides
11. #features
12. #firebase
13. #hosting
14. #building
15. #services
16. #these
17. #three
18. #writing
19. #service