In simple layman language, the MongoDB can get defined as a document-oriented NoSQL database with its primary application is a high volume of data storage. Unlike the traditional database systems, we are used to, that capitalizes on relational databases, MongoDB employs the use of documents and collections to store its data. Any MongoDB document associated with this database gets allocated a unique key-value pair that forms that foundation of MongoDB. On the other hand, when the term collection gets mentioned, it refers to a set of documents and functions. Collection can get equated to the typical relational database tables.