Amazon EMR
- Elastic MapReduce
 - Create Hadoop clusters (Big Data) to analyze and process vast amount of data.
 - Clusters are made of 100s of EC2 instances.
 - Auto-scaling and integrated with spot instances.
 
Node Types
- Master Node
 - Core Node: Run task and store data
 - Task Node (optional): Run task
 - Purchasing: On-demand, Reserved, Spot Instances