Is fault tolerance natively built into MongoDB?

Fault tolerance is indeed natively built into MongoDB. This is primarily achieved through its replica set feature, which allows for the automatic duplication of data across multiple servers or nodes. In a MongoDB replica set, one primary node handles the write operations, while secondary nodes maintain copies of the data. If the primary node becomes unavailable due to a failure, the replica set can automatically elect one of the secondary nodes to take over as the new primary. This ensures that the database remains accessible and operational even in the event of hardware or software failures.

Additionally, MongoDB's architecture supports automatic failover and data redundancy, which further contributes to its fault tolerance capabilities. As a result, applications using MongoDB can continue to function smoothly without significant downtime, providing resilience and reliability for critical operations. This built-in feature underscores MongoDB’s ability to handle failures gracefully, making it a robust choice for environments where data availability is crucial.