MongoDB

MongoDB is an open source NoSQL database management system that is known for its scalability.
MongoDB is especially useful for managing the structured, semi-structured and unstructured data produced by web applications.
MongoDB allows administrators to create records, which are called documents, without first having to define their structure.
MongoDB documents are written in BSON, a binary JavaScript Object Notation (JSON) representation that allows extensions for additional data types such as int, long and floating point.
Each BSON document contains one or more fields, and each field contains a value of a specific data type.