What is a Firebase and how it works?

How does it work? The Firebase Realtime Database lets you build rich, collaborative applications by allowing secure access to the database directly from client-side code . Data is persisted locally, and even while offline, realtime events continue to fire, giving the end user a responsive experience.

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How is Firestore billed?

When you use Cloud Firestore, you are charged for the following: The number of documents you read, write, and delete. The amount of storage that your database uses, including overhead for metadata and indexes. The amount of network bandwidth that you use.

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