NoSQL document database is a type or subset of NoSQL database designed for retrieving, storing, and managing document-oriented information, which is also referred to as semi-structured data. A NoSQL document database can also be referred to as a document store or document-oriented database. It is a type of nonrelational database and it is quite straightforward for developers to use. The intuitiveness can be attributed to the fact that the data in the application is represented typically as a JSON document. Therefore, by using the same model format of a document used in the application code, developers can persist data. Each document in a NoSQL document database is self-describing and they have a different or similar data structure. The documents are divided into “collections,” which does the same job as a table in relational databases. Some benefits of using a document database include flexible data modeling, fast query performance, and fast write performance. Unlike in the relational database where data are stored in separate tables, in document databases, information for an object is stored in the database in a single instance.