Answer / Nitesh Anand

MongoDB supports multiple storage engines: WiredTiger (default since MongoDB 4.0), MMAPv1, and In-Memory (WiredTiger only). Each engine offers different performance characteristics and tradeoffs. WiredTiger is a hybrid storage engine that provides both on-disk and in-memory storage with good performance and efficient resource utilization.nMMAPv1 is an older engine that provides stable, easy-to-debug storage but has poorer performance compared to WiredTiger. In-Memory storage is useful for use cases where you want to store data in memory for faster access.

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