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Amazon DynamoDB Accelerator (DAX) is a fully managed, highly available, in-memory cache for Amazon DynamoDB that significantly improves the performance of read-heavy workloads. It sits in front of your DynamoDB tables, caching frequently accessed data to reduce latency and increase throughput. DAX is ideal for applications that require very low latency and high read-throughput, such as mobile gaming apps, real-time dashboards, and online shopping carts. This helps your applications respond faster to user requests without requiring extensive code changes.