Which AWS service provides cloud-scale business intelligence to deliver insights that are easy to understand?

Amazon QuickSight is the correct answer because it is explicitly designed for cloud-scale business intelligence, making it easier for users to visualize and analyze their data. With features that include interactive dashboards and the ability to integrate data from various sources, QuickSight allows users to derive insights and make data-driven decisions quickly and efficiently. It also provides a user-friendly interface and leverages machine learning capabilities to offer insights that can be easily understood by both technical and non-technical users.

While Amazon S3 is primarily a storage solution, it does not provide business intelligence or analytics capabilities directly. Amazon Elastic MapReduce (EMR) is a managed cluster platform that simplifies running big data frameworks like Apache Hadoop and Apache Spark, which are used for processing large data sets but not specifically tailored for delivering business intelligence insights. Amazon Redshift, on the other hand, is a data warehousing service that facilitates big data querying and analytics, but it lacks the visualization and direct business intelligence features offered by QuickSight. Thus, QuickSight stands out as the best option for delivering easily understandable insights through its specialized capabilities.