NoSQL Databases

NoSQL databases, often interpreted as "Not only SQL," represent a class of database management systems that diverge from the traditional relational (SQL) model's rigid, table-based structure. Instead of enforcing a predefined schema, they utilize flexible data models—such as document, key-value, wide-column, and graph—making them ideal for handling large volumes of unstructured, semi-structured, and rapidly evolving data. Architected for horizontal scalability, NoSQL systems excel at distributing data across many servers, which provides high availability, fault tolerance, and performance for modern applications like big data analytics, real-time web services, and the Internet of Things (IoT).

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2. Fundamental Concepts and Theories