MongoDB is a non-relational document database that provides support for JSON-like storage. Its flexible data model allows you to easily store unstructured data. First released in 2009, it is the most commonly used NoSQL database. It has been downloaded more than 325 million times.
MongoDB is popular with developers because it is easy to get started with. Over the years, MongoDB has introduced many features that have turned the database into a robust solution able to store terabytes of data for applications.