MongoDB is a source-available cross-platform document-oriented database program. Classified as a NoSQL database program, MongoDB uses JSON-like documents with optional schemas. MongoDB is developed by MongoDB Inc. and licensed under the Server Side Public License (SSPL). MongoDB's document model is flexible and intuitive, allowing developers to store and retrieve complex data structures with ease. It supports ad-hoc queries, indexing, aggregation, and geospatial queries, making it suitable for a wide range of use cases including content management, e-commerce, real-time analytics, and mobile applications. MongoDB's distributed architecture provides horizontal scalability and high availability, allowing it to handle large volumes of data and thousands of concurrent users. MongoDB is used by thousands of organizations worldwide, including Adobe, Verizon, Expedia, and eBay, to build scalable and performant applications that can adapt to changing business requirements.