A NoSQL database provides a means for data storage, manipulation, and retrieval for non-relational data. The NoSQL databases are distributed, open source, and horizontally scalable. NoSQL often adopts the base model, which prizes availability over consistency, and informally guarantees that if no new updates are made on a data item, eventually all access to that data item will return the latest version of that data item. The advantages of this approach include the following:

• Simplicity of design
• Horizontal scaling and easy replication

• Schema free
• Huge amount of data support

We will now explore a few types of NoSQL databases.