NoSQL Key Value Databases is the most flexible type or a subset of NoSQL database that is designed for retrieving, managing, and storing associative arrays, a data structure is known commonly as hash table or dictionary. A key value database is also known as key-value store database or key-value store, and it stores data as an attribute name or key with its value. Each data item has a unique key and a pointer. Key value stores represent the key with arbitrary strings, and the value could be an image or a document. Schema is absent in key-value databases, which is unlike what you get in relational databases. Some of the common functions of NoSQL key-value databases include scalability, caching, data storage and retrieval, and a simple data structure. Derivable benefits of organizations using key-value stores include high performance, operational simplicity, high availability, flexible data modeling, and so on. The large volume of data and complexity involved in handling them has steered many organizations towards using key-value store databases.