Which AWS service is an in-memory data store service?

Explanations:

Amazon Aurora is a relational database service that is compatible with MySQL and PostgreSQL, designed for high availability and performance, but it is not an in-memory data store.

Amazon RDS (Relational Database Service) provides managed relational database services, including MySQL, PostgreSQL, Oracle, and SQL Server, but it does not serve as an in-memory data store.

Amazon DynamoDB is a fully managed NoSQL database service that provides key-value and document data structures. While it offers fast performance, it is not specifically an in-memory data store.

Amazon ElastiCache is an in-memory data store service that supports Redis and Memcached, designed to improve the performance of applications by allowing fast retrieval of data from memory.