MongoDB is the world's most popular NoSQL database, and its popularity stems from its innovative approach to data management that enables new breed of next-generation applications. The database's success can be attributed to its ability to model complex data structures in a more expressive way than traditional relational databases. As cloud adoption continues to grow, MongoDB is becoming the dominant database paradigm for operational data storage, with relational databases being used as specialized tools. This shift towards MongoDB is driven by the need for immediate use of large quantities of disparate data, which will ultimately lead to the decline of legacy database technology.