Non-Relational Databases, also known as NoSQL databases, provide flexible and scalable solutions for managing large-scale data that doesn't fit into traditional table structures. They support a wide range of data models and are ideal for big data and real-time applications.
Non-Relational Databases are used by organizations that need to store and retrieve large amounts of unstructured or semi-structured data. They offer versatility in terms of data models, including document, graph,...
this may be helpful to shed some light for you:
Choosing a non-relational database; why we migrated from MySQL to MongoDB
blog.serverdensity.com/choosing-a-non-relational-database-why-we-migrated-from-mysql-to-mongodb/
:-)