MongoDB is a high-performance, open source, schema-free document-oriented database. MongoDB is written in C++ and offers the following features:

* Collection oriented storage - easy storage of object-style data

* Dynamic queries

* Full index support, including on inner objects

* Query profiling

* Replication and fail-over support

* Efficient storage of binary data including large objects (e.g. videos)

* Auto-sharding for cloud-level scalability (Q209)