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What is MongoDB and what is benefit of mongodb?
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MongoDB is a document oriented database which provides good performance, high availability, and easy scalability. and it is a leading NoSQL.

MongoDB works on 2 concepts one is collection another  is document.
   1. Collection:- Collection is a group of MongoDB documents. It is equivalent of RDBMS table.
   2, Document:- A document is a set of key-value pairs. Documents have dynamic schema. Dynamic schema means the same collection do not need to have the same set of fields or structure, and common fields in a collection of documents, it may holds different types of data.
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