What is trigger in Firebase?

In a typical lifecycle, a Firebase Realtime Database function does the following: Waits for changes to a particular Realtime Database location. Triggers when an event occurs and performs its tasks (see What can I do with Cloud Functions? for examples of use cases).

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Can you use Firebase without functions?

Both Firebase databases provide a way for you to control access to data coming from apps using security rules (Cloud Firestore, Realtime Database). … However, when querying indirectly through Cloud Functions, the client SDKs can’t be used . You’re required to use the Firebase Admin SDK, or one of the other server SDKs.2 Haz 2019

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