Document
It is the basic unit of MongoDB and a single record inside a collection is known as a document. It is a JSON object which has the data in the form of key-value pairs.
Defining, Creating and Dropping a MongoDB collection
MongoDB, the most popular NoSQL database, is an open-source document-oriented database. The term ‘NoSQL’ means ‘non-relational’. It means that MongoDB isn’t based on the table-like relational database structure but provides an altogether different mechanism for storage and retrieval of data.