MongoDB is an open source NoSQL database from the company MongoDB, formerly known as 10Gen. This is a document-oriented database designed to store large (humongous) amounts of data.

MongoDB stores documents consisting of name/value pairs, arrays, and other structures found in JSON (JavaScript Object Notation). Documents are organized in collections. Collections and documents are roughly equivalent to tables and rows in a relational database.

NoSQL is sometimes defined as Not Only SQL, but MongoDB does not provide a SQL client, API, or a JDBC driver. Unlike relational databases, MongoDB does not use pre-defined schemas.

However, there is a third party JDBC driver available from UnityJDBC. This driver generates metadata by reading documents and determining the least specific data type to represent the data.