MongoDB is a popular open-source NoSQL database designed for storing and managing large volumes of unstructured or semi-structured data. Unlike traditional relational databases that use tables and rows, MongoDB stores data in flexible, JSON-like documents called BSON (Binary JSON). This document-based model allows for more dynamic and scalable data structures, making MongoDB an ideal choice for modern applications that require high performance and flexibility. Developed by MongoDB Inc., it is widely used in web development, big data, real-time analytics, and cloud-based applications. MongoDB supports features such as indexing, aggregation, replication, and horizontal scaling through sharding, which helps manage growing data efficiently. It also provides an easy-to-use query language and integrates seamlessly with popular programming languages like JavaScript, Python, and Java. With its high scalability, schema-less design, and strong community support, MongoDB has become a preferred database solution for developers building fast, scalable, and data-intensive applications.