Final answer:
Azure HDInsight is a cloud service in Azure that provides managed Hadoop clusters for big data processing and analytics.
Step-by-step explanation:
The service being described is Azure HDInsight, which is a Hadoop service offering hosted in Azure. This service enables the creation and management of clusters of managed Hadoop instances, providing a cloud platform for big data analytics that can handle massive amounts of data processing. Azure HDInsight supports a variety of big data technologies in addition to Hadoop, such as Apache Spark, HBase, Storm, and Kaf_ka.