Firebase co-founder James Tamplin says, the Realtime Database (RTDB) was always the flagship product of the platform. The service is now in use by hundreds of thousands of developers. Tamplin argues that these developers love the service because it offers them access to a real-time database that is managed and scaled for them by Google.
Firestore was designed from the ground up to support a number of use cases like making it easier for developers to build offline apps with the help of a local database for web, iOS and Android and to easily sync data between different apps and users in real time.
The team also notes that its client-side SDK can handle an app’s authentication and networking code while the backend offers a number of security rules to control access to the data and apply validation logic to it, too. Thanks to these features, you can connect your app directly to the database without using an intermediary server that would otherwise handle these validation steps.
