Mongo DB , as I have explained in one of my previous post( What is MonGODB ), is a Non- Relational Document Oriented Database. Consider, an Relational database like MYSQL, when we want to perform operations on MySQL DB, we have a query language named SQL. But in MongoDB, we don’t have another query language to perform these operations. For every operation, there exists a programming language API, that is used to perform the operations. So, Basically there are four operations that can be performed on a database known as(CRUD operations)     a)       Insertion     b)       Getting data from database     c)        Updating data in database     d)       Removing data Before moving forward lets just get familiar with few terms:     a)       Document : its like a...