Define NoSQL databases and explain the primary motivations behind their development. Provide examples of scenarios where each type of NoSQL database is suitable.

NoSQL databases, or "Not Only SQL" databases, are a class of database management systems (DBMS) that differ from traditional relational databases in their data model, storage mechanisms, and scalability. They emerged as a response to the limitations of relational databases in handling the massive volumes of data generated in the era of big data and web-scale applications. The primary motivations behind the development of NoSQL databases include:

1. Scalability: NoSQL databases are designed to scale horizontally, meaning they can efficiently handle large amounts of data across multiple servers or clusters. Unlike traditional relational databases, which often scale vertically by adding more powerful hardware, NoSQL databases distribute data across a cluster of commodity hardware, allowing for linear scalability.

2. Flexibility: NoSQL databases offer flexible schema designs, ______ __________ __________ _______ ______ ___ ____ __________.
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