NoSQL databases provide flexible, scalable alternatives to relational databases by using different data models tuned for specific application needs. This guide explains the primary NoSQL types: key-value, document, wide-column, and graph. It shows real product examples for each, and provides quick usage guidance so you can choose the right store for your application. Traditionally, we use a relational database to work with an application. Of course, a relational database is a structured database and contains multiple tables to maintain meaningful relations between them. Additionally, it uses SQL like queries to operate with data stored in the tables. In contrast, suppose we have to work with a large amount of unstructured data which is not advantageous to store in the form of tables,