MongoDB is a document-oriented NoSQL database used in financial services for its flexibility, scalability, and reliability. Its document model allows for a dynamic schema, enabling organizations to adapt to changing business needs without rigid table structures. This approach simplifies data management, enhances application performance, and reduces costs. Financial institutions are increasingly adopting MongoDB, leveraging its features such as open finance, personalized banking experiences, encryption, data sovereignty, multidocument ACID transactions, payment system scalability, fraud detection, financial data management, and AI-driven interactive banking. By employing a flexible schema, MongoDB supports innovation by providing a scalable environment that enables businesses to rapidly develop new financial services and scale to support millions of users.