An Amazon Elasticache is a web service allows you to easily deploy, operate, and scale an in-memory cache in the cloud.

For an AWS interview question asking about Amazon ElastiCache, the correct answer would be:

“Amazon ElastiCache is a fully managed in-memory caching service provided by Amazon Web Services (AWS). It allows you to deploy, manage, and scale popular open-source compatible in-memory data stores such as Redis and Memcached in the cloud. ElastiCache helps improve the performance and scalability of applications by caching frequently accessed data, reducing the load on databases and improving overall application responsiveness.”