Answer: Amazon DynamoDB, Amazon ElastiCache

## Explanation **Amazon DynamoDB** is a fully managed NoSQL database service that provides fast and predictable performance with seamless scalability. It's a key-value and document database that delivers single-digit millisecond performance at any scale. **Amazon ElastiCache** is a fully managed in-memory data store and cache service that supports Redis and Memcached. While primarily used for caching, Redis (one of the engines supported by ElastiCache) is a NoSQL database that supports various data structures like strings, hashes, lists, sets, and more. **Why the other options are incorrect:** - **Amazon Redshift**: A fully managed data warehouse service designed for online analytical processing (OLAP), not a NoSQL database - **Amazon Aurora**: A relational database service compatible with MySQL and PostgreSQL, not a NoSQL database - **Amazon RDS for MySQL**: A managed relational database service for MySQL, which is a SQL database, not NoSQL NoSQL databases are characterized by their non-relational data models and include document databases, key-value stores, wide-column stores, and graph databases.

Author: Ritesh Yadav