Availability: Free and Open Source
It is a NoSQL database, which is highly scalable, flexible and distributed.
It is an open source database management system (DBMS) that uses a document-oriented data model
It is used by some of the largest companies in the world, including Facebook, Google, Nokia, MTV Networks, Cisco, Forbes, and many more.
Here the documents are stored as JSON document
Ad hoc queries
Indexing
Replication
Load balancing
Aggregation
File storage