MongoDB is a distributed schema-free document-oriented database which is Created at 10gen. It stores documents as BSON (Binary JSON) which are binary encoded JSON like objects. BSON supports nested object structures with embedded objects and arrays. At the heart of MongoDB is the concept of a document which is represented as an ordered set of keys with associated values. A collection is a group of documents. If a document is the MongoDB analog of a row in a relational database, then a collection can be thought of as the analog to a table. Collections are schema-free. This means that the documents within a single collection can have any number of dierent shapes. MongoDB groups collections into databases.
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