NoSQL databases, which stand for "Not only SQL," emerged to address the limitations of traditional relational databases in accommodating the modern data landscape characterized by vast data volumes, diverse formats, and real-time processing needs. Unlike relational databases designed for minimizing data duplication, NoSQL offers flexible data models such as key-value, document, column, time series, and graph, which cater to varying application requirements. Modern NoSQL databases, like Couchbase Capella, integrate key relational database features, support agile development through schema-less structures, and enable horizontal scaling, which allows for easier expansion and adaptation to changing needs. They are particularly suited for applications requiring high availability, dynamic user experiences, and scalability across web, mobile, and IoT platforms. The use of JSON as a standard data format in NoSQL facilitates seamless data handling across multiple devices and use cases, while also permitting developers to use familiar SQL-based queries. By offering Database-as-a-Service (DBaaS), NoSQL platforms simplify operations, enhance security, and provide cost efficiencies, making them a popular choice for enterprises looking to optimize their digital infrastructure.