What is Firebase? In developing a mobile app for iOS or Android, or a web application , the database is one of the most challenging parts. This is not because it's hard to design but because it's very tricky to design. It can do a lot of things like cloud messaging, app notifications, and advertisement programs. There are so many things to see on the feature page. Since everyone has to log in using social media such as Facebook, Twitter, or Google, or even a simple login system that is difficult to design from scratch, managing your authentication system can be difficult. It is possible, but it is difficult to design. Authentication You can do all sorts of authentication with Firebase. It gives you a complete solution to taking things down. Username, email, and password are the most common ones. It is of course possible to log in with a Twitter account, Facebook account, Google account, and GitHub account. All the things you can imagine can be found there. Real-Time database