Unable to Use the Logical OR Operator in Firebase Firestore Security Rules

It is kind of security for the Firestore database.
It will control who can access,read,write or edit data on the Firebase Datastore.
We need to define rules for authorisation on who can access it.
It is for keeping crucial data safe.

Example script:

service cloud.firestore {
  match /databases/{database}/documents {
    match /collection/{document} {
      allow read, write: if <condition>;
    }

  }
}

 
-> service cloud.firestore: Specifies that these rules are for Firestore.
-> match /databases/{database}/documents: Targets your Firestore database.
-> match /collection/{document}: Targets a specific collection or document.
-> allow read, write: if : Grants access if the condition is true.

Also Read:

Cloud Maturity Model