MongoDB

MongoDB is a open source NoSQL database, written in C++. MongoDB is a cross platform document oriented database.

What is a document?

Document is a set of key-value pairs.

Example

{

  "id": 1,

  "firstName": "Hari Krishna",

  "lastName": "Gurram"

}

Above document contains information about a person. There is no schema for documents.

What is a collection?

Collection is a group of documents. You can correlate collection as table and document as a row in the table. Documents in same collection don’t need to have same fields/structure.

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