Which AWS service is a key-value database that provides sub-millisecond latency on a large scale?

Explanations:

Amazon DynamoDB is a fully managed NoSQL database service that provides key-value and document data models, offering sub-millisecond latency and seamless scalability.

Amazon Aurora is a relational database compatible with MySQL and PostgreSQL, optimized for high performance and availability, but not a key-value database.

Amazon DocumentDB is a managed document database service with MongoDB compatibility, designed for JSON data, but it does not provide key-value storage.

Amazon Neptune is a graph database service designed for connected data and graph models, not a key-value database.