Amazon ElastiCache is a web service that makes it easy to deploy, operate, and scale an in-memory cache in the cloud. It improves the performance of web applications by allowing you to retrieve information from fast, managed, in-memory caches, instead of relying solely on slower disk-based databases. ElastiCache supports two open-source in-memory caching engines: Redis and Memcached. Implementing ElastiCache can help to significantly decrease the load on the database by caching the most frequently accessed data and serving it from the cache during spikes in read traffic.