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Basically, Firebase is a ready to use service by google to customers, who do not have the expertise to scale the backend or enough money to buy those heavy backend machines(servers).

Firebase is a mobile app development platform from Google that helps developers build and grow high-quality apps. It offers a variety of tools and services to streamline the development process, including backend services, authentication, databases, analytics, and more.

Just a prop server. If you’re just starting up it might help you, as you don’t have to buy your own servers and get it on a monthly basis from firebase’s cloud server