Introduction MongoDB is a popular NoSQL database that uses a document-oriented data model. Unlike traditional relational databases, MongoDB does not use tables, rows, or columns to store data. Instead, it uses collections of documents, which are similar to JSON objects. MongoDB was developed by MongoDB Inc. and released in 2009. It is written in C++ and is available under the Apache License 2.0. Document-oriented data model In MongoDB, data is stored in collections, which are similar to tables in relational databases. However, unlike tables, collections do not enforce a fixed schema. Each document in a collection can have its own set of fields and data types, making MongoDB highly flexible. Documents in MongoDB are stored in BSON format, which is a binary representation of JSON. BSON allows for efficient storage and retrieval of data, and also supports additional data types such as binary data and date/time values. Query language MongoDB provides a rich query language for searchi...