A Key-Value Store is a type of database that uses a simple data model to store information. In this model, data is organized as a collection of key-value pairs, where each key is unique and is used to retrieve its corresponding value. This structure allows for fast access and retrieval of data, making it ideal for applications that require quick lookups. Key-Value Stores are often used in scenarios like caching, session management, and real-time analytics. Popular examples include Redis, Amazon DynamoDB, and Riak. These databases are known for their scalability and performance, especially when handling large volumes of data.