Data consistency in MongoDB can be ensured by using transactions. A transaction is a set of operations that are executed as a single unit and either all of them are applied or none of them are applied.

For example, if a customer wants to transfer money from one account to another, the transaction would include both the debit and credit operations. If either one of the operations fails, the entire transaction should be rolled back.

MongoDB provides the ability to use transactions across multiple documents, collections, and databases. This helps ensure data consistency by ensuring that all operations within the transaction are either all applied or none are applied.

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