What is Amazon ElastiCache?

The in-memory caching provided by ElastiCache, which can be used to improve latency and throughput for many heavily read application workloads or compute-intensive workloads .For the finest scenarios like where the Database load is based on Online Analytical Processing (OLAP) transactions. AWS ElastiCache is an In-memory key/value store. It is managed service provided by AWS.

Elastic cache provides two ways to configure:

Memcached
Redis

Difference between Redis and Memcached as below:

Redis	MemCache
Redis does not have native clustering yet, but working on developing this feature too.	It does native clustering, hence if you need a robust clustering memcache, for Memcached.
Redis is a data structure server which do not only caching but you can also do share queue, message solution(pub/sub), sessions and sorted sets. so it is really good for Key-> Some-Object.	Good at doing simple key-value cache. But if you want t use other feature or requirement changes, REDIS is the right way to go. So, it is good for KEY->String.
You can cache bigger values in Redis cache. Values upto 512MP per key.	Size is limited for the values cached. Values cached upto 1MB/Key.
It’s powerful data types and powerful commands to leverage them(Hashes, Sorted Sets and many more..)	Good for multi-threaded environments.
Redis is slower compared to Memcache.	Memcache is faster compared to REDIS.

Use Cases – In which Scenario we need to think to choose Redis or Memcached:

Use Case	Benefits
Web Session Store	In cases with load-balanced web-servers, store web session information in Redis so if a server is lost by any means, the session information is not lost and another web server can pick it up from there.
Database caching	Use Memcached in front of AWS Relational Database(RDS) to cache popular queries to offload work from Relational Database(RDS) and return results faster to users.
Leaderboards	Use Redis to provide a live leaderboard for millions of users of your mobile applications.
Streaming data dashboards	Provide a landing spot for streaming sensor data on the factory floor, providing real/live-time dashboard for displays.