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  What is Redis? Redis is an open source in-memory data structure cache and store, developed and maintained by the passionate Redis community. It is widely accepted as a fast in-memory database or application cache solution. The idea that Redis is a platform that can be considered both a cache and a database at the same time sets it apart from other solutions. Redis works by placing datasets in memory and only using slower disk storage to periodically save the data so that it is persistent across computer restarts. This enables Redis to deliver excellent data read or write performance with sub-millisecond latency and support for multiple data structures with built-in replication and clustering capabilities. From an operational perspective, Redis can be difficult to deploy, monitor, and scale yourself. However, these challenges can be overcome and made easier with a managed service such as the new AWS ElastiCache Redis service. What is Amazon ElastiCache for Redis? AWS ElastiCache is a managed caching service compatible with both Redis and Memcached. For Redis, ElastiCache offers a fully managed platform that makes it easy to deploy, manage, and scale a high-performance distributed in-memory data storage cluster. These capabilities can significantly reduce operational overhead for machine maintenance, software patching, monitoring, disaster recovery and backup. AWS ElastiCache is fully compatible with common Redis data structures, APIs, and clients, allowing your existing applications that already use Redis to start using ElastiCache without any code changes. It supports both clustered and non-clustered Redis modes and provides increased high availability and reliability with automatic failover scenarios across Availability Zones. With support for online cluster resizing, ElastiCache allows you to easily scale in or out to accommodate changing system requirements without any downtime. From a security and compliance perspective, AWS ElastiCache has built-in VPC support and offers in-transit and at-rest encryption capabilities combined with native Redis AUTH functionality to support authentication and authorization. Getting started with Amazon ElastiCache for Redis Step 1: Set up your AWS environment Before you can start using Amazon ElastiCache Redis, you'll need to set up your AWS environment. Here's a quick guide on how to do it: 1.1. Start by deploying an EC2 instance in your AWS environment. The instance will be used to run a sample application that uses a Redis cluster. For simplicity, we will use the same Amazon VPC for both the EC2 instance and the ElastiCache cluster, so no additional configuration is required.