ElasticCache

• ElastiCache is a managed in-memory caching service
• ElastiCache can launch either Memcached or Redis
• Memcached is a simple key / value store preferred for caching HTML fragments and is arguably faster than Redis
• Redis has richer data types and operations. Great for leader-board, geo-spatial data or keeping track of unread notifications.
• A cache is a temporary storage area.
• Most frequently identical queries are stored in the cache
• Resources only within the same VPC may connect to ElastiCache to ensure low latencies.