The advantage of using NoSQL databases over traditional SQL databases lies in their ability to handle unstructured and semi-structured data more effectively. NoSQL databases, such as MongoDB and Cassandra, are designed to scale horizontally and accommodate large volumes of data across distributed systems. Unlike SQL databases, which rely on fixed schemas, NoSQL databases offer greater flexibility, allowing developers to store data in various formats (e.g., key-value pairs, documents). This adaptability makes NoSQL a preferred choice for modern applications that require real-time data processing and dynamic schema changes, enhancing performance and scalability.