Amazon ElastiCache makes it easy to set up, manage, and scale distributed in-memory cache environments in the AWS Cloud.
It provides a high performance, resizable, and cost-effective in-memory cache,
while removing complexity associated with deploying and managing a distributed cache environment.
ElastiCache works with both the Redis and Memcached engines;
to see which works best for you, see the Comparing Memcached and Redis topic in either user guide.