As per official Firebase documentation −
Firebase can power your app's backend, including data storage, user authentication, static hosting, and more. Focus on creating extraordinary user experiences. We will take care of the rest. Build cross-platform native mobile and web apps with our Android, iOS, and JavaScript SDKs. You can also connect Firebase to your existing backend using our server-side libraries or our REST API.
Real-time Database − Firebase supports JSON data and all users connected to it receive live updates after every change.
Authentication − We can use anonymous, password or different social authentications.
Hosting − The applications can be deployed over secured connection to Firebase servers.
It is simple and user friendly. No need for complicated configuration.
The data is real-time, which means that every change will automatically update connected clients.
Firebase offers simple control dashboard.
There are a number of useful services to choose.
In the next chapter, we will discuss the environment setup of Firebase.