In this lesson, the student will learn about Amazon DynamoDB Accelrator, otherwise known as DAX. DynamoDB is already optimized for performance and can deliver response times in the single-digit milliseconds. And for most use cases this is acceptable. But some use cases require microsecond response times and this is where DAX can be used. This lesson will detail the use cases for DAX and ultimately, walk through the configuration of a DAX Cluster. A DAX Cluster is a cluster of memory nodes which work together to provide the single digit microsecond response times.