Amazon DynamoDB is a NoSQL Database featured as a part of the AWS.

Quoting Wikipedia:

Amazon DynamoDB is a fully managed proprietary NoSQL database service that is offered by as part of the Amazon Web Services portfolio. DynamoDB exposes a similar data model and derives its name from Dynamo, but has a different underlying implementation. Dynamo had a multi-master design requiring the client to resolve version conflicts and DynamoDB use synchronous replication across multiple datacenters for high durability and availability.