What are NoSQL databases? How are they different from relational database management system? List the features of any four types of NoSQL databases.

NoSQL databases, often referred to as "Not Only SQL" databases, are a category of databases designed to handle large volumes of unstructured or semi-structured data, offering flexible and scalable data storage and retrieval solutions. Unlike traditional Relational Database Management Systems (RDBMS), NoSQL databases are specifically designed to meet the requirements of modern web applications, big data analytics, and other scenarios where massive amounts of data need to be processed efficiently. The key differences between NoSQL databases and relational databases lie in their data models, scalability, flexibility, and architecture.

Differences between NoSQL and Relational Databases:

1. Data Model:

   • Relational Databases: RDBMSs use a structured data model based on tables, rows, and columns. Data is stored in predefined schemas, and relationships between tables are established using foreign keys.
   • NoSQL Databases: NoSQL databases use various data models, such as key-value pairs, document-based, column-family, ___ __________ _____ ___ _______.
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