MongoDB is one of the most popular No SQL databases, which has a flexible structure and is mostly used in projects with large volumes of data. This database is an open-source and free platform and works with the Document-Oriented data model and can be used on Windows, Mac, and Linux. The data values stored in Mongo DB are used with two primary keys (Primary Key) and Secondary (Secondary Key).
Mongo DB contains a set of values. These values are in the form of documents that contain different types of data with different sizes. This allows Mongo DB to store complex structured data such as hierarchical or array data.