Key-Value Stores

A key-value store, also known as a key-value database, is a storage system that stores, indexes, and looks up data using key values. Unlike in a conventional relational database, each record in a key-value store system has only two fields: a key and a value. A key is globally unique in a key-value database and is used to search for a record. A value is an unstructured binary string, and its semantics are generally opaque in the key-value database.