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The OR logical operation is used in Firestore Query to filter documents based on multiple possible conditions. It allows you to retrieve documents that meet at least one of two or more conditions. For example, you can use OR logic to retrieve all documents where the value of a field is either A or B.

Here's an example of how to use the OR operation in a Firestore Query in Node.js:

const query = db.collection('myCollection')
  .where('field1', '==', 'A')
  .orWHere('field2', '==', 'B');

This query will retrieve all documents where the value of 'field1' is 'A' OR the value of 'field2' is 'B'.