MongoDB is a document – Oriented , No Sequel (NoSQL) Database. MongoDB is a document database with the Scalability and Flexibility. It is a distributed database built for Modern Application Developers. It store data in BSON. NOSQL WHY? It’s a non-relational, document-oriented database management system and works on document-based database. MongoDB stores data in form of documents. MongoDB uses BSON to Query database. What is BSON : Bson Stands for binary JSON. It containing a field name , type ,and value. The BSON type format is lightweight, highly traversable and fast in nature. Characteristics: Replication Sharding Schema less