MongoDB Enterprise Server is the commercial edition of MongoDB. It includes:
In-memory Storage Engine - deliver high throughput and predictable low latency
Encrypted Storage Engine - encrypt your data at rest
Advanced Security - secure your data with LDAP and Kerberos access controls, and comprehensive auditing
MongoDB Enterprise is available as part of the MongoDB Enterprise Advanced subscription, which features the most comprehensive support for MongoDB and the best SLA, in addition to Ops Manager, Compass and the Connector for BI.